Can Crohn's Disease Affect Your Teeth and Gums?

Yes, but almost certainly not in the way the pages currently ranking for this question tell you. The finding that survives study after study is not cavities. It is gum inflammation at the same amount of plaque, alongside more dental treatment received across a lifetime and, in the one small paediatric study that looked, less complex trabecular bone in the jaw. Whether Crohn's itself drills more holes in your enamel is genuinely unsettled, and the pooled figures that get quoted for it do not hold up to arithmetic.

That distinction matters, because it changes what you do. If the problem were purely decay, the answer would be more fluoride and less sugar, which is what every dental blog says and what you have already tried. If the problem is inflammation in the tissue holding your teeth in, acid from somewhere other than your diet, and a mouth that has stopped producing enough saliva, then the answer is a different conversation with a different set of people.

The short answer, and why it is narrower than every page you have read

Crohn's disease can affect your mouth in four separate ways, and they are worth keeping apart because they have different evidence behind them and different fixes.

1. Inflammation in the oral tissues themselves. Aphthous ulcers and, less commonly, granulomatous lesions. This is the one dentists learn about, and the one covered properly in our post on mouth ulcers with Crohn's disease.
2. Inflammation in the gums and the bone that holds your teeth. This is the best-evidenced effect on your teeth as structures, and the least discussed.
3. Damage from something downstream of having the disease. Acid from reflux or vomiting, a dry mouth from medication, bone loss from steroid courses, long periods of sipped liquid nutrition. Real, documented, and not the immune process arriving in a new tissue.
4. Nothing to do with Crohn's at all. Grinding, an old filling failing, a genetically thin enamel, a crowded lower arch. A Crohn's label is very good at swallowing a diagnosis that needed its own treatment.

For what counts as a genuine extraintestinal manifestation versus a downstream consequence, our post on joint pain with Crohn's disease holds the shared explainer, including which symptoms outside the gut rise and fall with bowel activity and which run their own course. The rest of this article is about teeth, gums and jaw specifically.

The finding that survives every study: inflamed gums at the same amount of plaque

This is the single most useful sentence in the literature, and no consumer page carries it.

In a case-control study of 55 children and adolescents with IBD in remission and 55 matched controls, the plaque control record was essentially identical between groups, 42% against 41%. The gingival index was not: 40% against 24%. Periodontal treatment need was significantly higher, 47% needing treatment for gingivitis against 4% of controls, and none of the children with IBD had a healthy periodontium at all, against 69% of the controls (Koutsochristou 2015).

A study of 32 children with IBD found the same pattern from the other direction. The caries index showed no significant difference, there was no dental erosion in the IBD group at all, and yet the gingival index was markedly higher despite no significant difference in plaque scores (Haznedaroglu 2023).

The larger adult studies point the same way. In 389 Chinese patients with IBD against 265 controls, both Crohn's and ulcerative colitis came out as risk indicators for periodontitis after full adjustment, with odds ratios of 4.46 and 4.66, and significantly more sites with deep pockets and attachment loss (Zhang 2020). In 100 Portuguese patients, periodontal disease was present in 57% with Crohn's and 70% with ulcerative colitis against 29% of controls, with severe stages more frequent (Rodrigues 2025).

Does Crohn's actually cause more cavities? Eight studies, four answers

Here the literature stops agreeing with itself, and you deserve to know that rather than be handed a number.

Read the right-hand column again. Four found a difference, three found none, and the 2006 study found both at once: no difference on the tooth-surface index but significantly more people with dentine caries. The study with the largest control-to-case contrast found the IBD group had numerically fewer decayed, missing and filled teeth than controls, a result its authors described as comparable (Rodrigues 2025).

There is also a measurement problem buried in this that explains part of the disagreement. The DMFT index counts decayed, missing and filled teeth, so a filling counts the same as a hole. It therefore measures your lifetime access to dentistry as much as your disease. Someone who has never been able to afford a dentist scores low on a measure that is supposed to detect their neglect. The register study that found more fillings and endodontic treatment in Crohn's patients is measuring treatment received, not disease present (Johannsen 2015), and the study that found the highest raw DMFT pulled its data from a dental school's own patient database, where everyone in it had already sought care (Tan 2021).

And one confounder runs the opposite way to the one you would expect. In the paediatric study that found no difference, the control children ate significantly more candy, sweetened milk and lemon gum than the children with IBD (Haznedaroglu 2023). If anything that biased the study towards finding more decay in the controls, and it still found nothing.

The two pooled analyses, and the arithmetic we could not reconcile

Both meta-analyses of caries in IBD conclude that decay is more common. We are not disputing the direction. We are saying that neither number is quotable as printed, and we checked both abstracts directly.

The 2021 meta-analysis of five studies reports a weighted mean difference in DMFT of 3.04, with a 95% confidence interval of 1.52 to 4.56, and a p value of 0.10 (Marruganti 2021). Those two statements contradict each other: an interval that excludes zero corresponds to a p value below 0.05, not 0.10. The same abstract gives the ulcerative colitis subgroup as 4.01 with the interval 1.52 to 4.56, which is byte-identical to the overall pooled interval and cannot be correct as printed, and which would place the point estimate almost at the top of its own interval.

The 2025 bidirectional meta-analysis of 20 studies reports that periodontal disease did not significantly raise overall IBD risk, with an RR of 1.31 and a 95% confidence interval of 0.98 to 1.35 (Zhang 2025). For a ratio measure, an interval running from 0.98 to 1.35 around a point estimate of 1.31 is not geometrically possible: the distance below the estimate is thirteen times the distance above it. The same paper's own UC subgroup runs to an upper bound of 1.73, so the overall analysis cannot have a tighter upper bound than 1.35. Its caries estimate, a weighted mean difference of 2.51 with an interval of 0.97 to 4.06, is the only caries figure in this literature we would repeat, and its lower bound sits close enough to zero that a single additional null study could move it.

The subgroup nobody checks: the headline link runs to colitis, not Crohn's

This is the part that should change how you read every other article on this subject, and it is a straightforward subgroup check.

Three separate meta-analyses in three years have asked whether having gum disease raises your risk of developing IBD. All three found the same pattern, and it is not the one that gets quoted.

• The 2024 review of longitudinal studies found periodontitis did not raise overall IBD risk (pooled RR 1.04, 95% CI 0.99 to 1.09). Split by subtype, it was associated with ulcerative colitis (RR 1.12, 1.04 to 1.21) and not with Crohn's disease (RR 0.98, 0.92 to 1.04) (Wang 2024).
• The 2025 review found the same shape: no significant overall increase, but a higher risk for ulcerative colitis specifically (Zhang 2025).
• The 2026 review, covering 22 studies and over 12.6 million participants, found that in cohort studies periodontitis showed only a non-significant trend for IBD overall (RR 1.25, 0.98 to 1.58), nothing for Crohn's (RR 1.05, 0.86 to 1.29), and a significant association with incident ulcerative colitis (RR 1.18, 1.07 to 1.31) (Aimetti 2026).

Three teams, three datasets, one answer: in that direction, it is a colitis finding. "Studied in a population that includes yours" is not the same as "found in yours".

The direction that does hold for you runs the other way. Having IBD raises the risk of developing periodontitis over time, and here the two pooled estimates disagree on magnitude: 1.37 in one (Wang 2024) and 2.14 in the other (Zhang 2025). We cannot settle that from the abstracts, and the honest summary is "raised, somewhere between modestly and roughly doubled".

There is one more reason to be careful with the 2006 adult study that is still cited as evidence of periodontal damage in IBD. Its only statistically significant periodontal result ran the wrong way: mean probing pocket depth was 2.08 mm in the IBD group against 2.23 mm in controls, p = 0.014. The attachment-loss differences that favour the IBD-is-worse reading did not reach significance, at p = 0.07 (Grossner-Schreiber 2006). Its authors said so plainly in their own conclusion. Later summaries did not.

Your jawbone, not your teeth: the most Crohn's-specific finding here

If you want the one result in this literature that is specifically about Crohn's rather than IBD in general, it is not about teeth at all.

A 2026 multicentre case-control study took routine digital panoramic radiographs of 34 children with IBD and 34 matched controls and measured mandibular trabecular bone using fractal dimension analysis, which quantifies how complex the internal bone architecture is. Caries experience showed no difference. Periodontal treatment need showed no difference. But fractal dimension was significantly lower in the IBD group at the condyle (p = 0.047) and at the molar region (p less than 0.001), and children with Crohn's had lower condylar values than those with ulcerative colitis (p = 0.046) (Cege 2026).

Treat that carefully. The Crohn's subgroup was 10 children against 24 with colitis, which is a very small group on which to hang a p value of 0.046, and fractal dimension is a research measure rather than something your dentist reports. But the direction fits everything else known about bone in this disease, which is where the evidence is much larger.

A Danish population-based inception cohort followed 513 patients for over a decade and found osteoporosis diagnosed in 14.2% of them against 6.6% of controls, with odds ratios of 2.9 for Crohn's and 2.8 for ulcerative colitis. Two thirds of the cohort received at least 500 mg of corticosteroid within a year, generating 781 patient-years at risk, and only 10.6% of those patient-years were followed by a bone density scan (Lo 2020).

The counterweight is worth stating. A Manitoba analysis of 1,230 people with IBD inside a 45,714-person bone density database found IBD had a statistically significant but small effect on T score and did not raise osteoporosis risk overall once age, sex, BMI, hormone therapy and corticosteroid use were adjusted for. Crohn's was associated with raised risk at the lumbar spine and trochanter; ulcerative colitis was not (Targownik 2013). So much of the raw bone risk is carried by the things that come with the disease rather than the disease itself, which is a more hopeful reading, not a dismissal.

Why your dentist's saliva test may read differently on you

This is new, specific to Crohn's, and worth knowing before someone shows you a chairside result.

Salivary biomarker tests are entering dental practice as a way to flag periodontal disease early. A 2026 study collected stimulated saliva from 35 patients with Crohn's and 35 matched controls and examined three markers. In the controls, all three tracked periodontal status cleanly. In the Crohn's group, only one of the three did. Among people who were periodontally healthy, those with Crohn's already had significantly higher salivary elastase and MMP-9 than controls, and among people who had periodontitis, there was no significant difference between the Crohn's and control groups on any marker. The authors concluded that diagnostic accuracy of two of these markers is reduced in Crohn's, probably reflecting altered neutrophil behaviour in the mouth (Toivanen 2026).

The same picture appears from a different angle. Salivary calprotectin is elevated in IBD, particularly in Crohn's, irrespective of whether the person has caries or periodontitis, and it does not correlate with faecal calprotectin. Salivary neutrophils from patients showed reduced CD11b expression (Majster 2025). A separate study found salivary calprotectin did not correlate with disease activity or oral health status at all, so it is not a shortcut for either (Rodrigues 2025).

Put together, the practical reading is that your mouth appears to sit at a raised inflammatory baseline that is not simply a reflection of your gut activity or your brushing. If you are ever offered a salivary test result as reassurance or as alarm, that context belongs in the conversation. For why gut markers and symptoms so often disagree in the other direction too, see high calprotectin but no symptoms.

There is mechanism work underneath this, and it is honest to say it is mostly mouse work and that it points somewhere counterintuitive. Using two mouse models with reduced saliva, a 2026 study funded by the US National Institute of Dental and Craniofacial Research found that a lack of saliva delayed the development of chemically induced colitis, and identified two opposing salivary peptides, one protective and one damaging, acting mainly on the gut barrier (Aoun 2026). That is interesting biology and it is not a reason to think less saliva is good for you: in humans, less saliva means more decay, for reasons that have nothing to do with colitis.

Where the non-mysterious damage comes from: acid, dry mouth and drugs

If your teeth are visibly worn, chipping at the edges or thinning at the gumline, the most likely explanation is not immune inflammation. It is acid, and the second most likely is a dry mouth.

Acid. An overview of reviews, covering ten systematic reviews plus eight additional primary studies, concluded that gastro-oesophageal reflux is a risk factor for erosive tooth wear, with a positive association across studies, while noting substantial heterogeneity and a low overall level of evidence. Findings on saliva flow rate and buffering capacity in reflux were contradictory (Chatzidimitriou 2023). Reflux and repeated vomiting are common in active Crohn's, particularly with upper gastrointestinal or stricturing disease, and this is the route that produces the wear pattern dentists sometimes mistake for an eating disorder. Notably, the one IBD study that specifically looked for erosion found none in its IBD group (Haznedaroglu 2023), which fits: erosion tracks the acid, not the diagnosis. Our post on nausea after eating with Crohn's covers the upper-gut symptoms themselves.

Dry mouth. Saliva buffers acid and carries the calcium and phosphate that repair early enamel damage, so less of it means faster decay, full stop. The World Workshop on Oral Medicine systematic review screened 3,867 records and identified 56 substances with a higher level of evidence and 50 with a moderate level of evidence of causing salivary gland dysfunction, dry mouth or the opposite, spanning nine of the fourteen top-level drug groups including the alimentary and nervous system categories (Wolff 2017). We are not going to list which of your medicines is the culprit, because that depends on your whole list and because the review's own limitation is that objective salivary flow was rarely measured. Ask a pharmacist to review the lot. Do not stop anything on your own.

Steroids. There is no trial showing prednisone dissolves enamel, and the recurring community report that a steroid course precedes a broken tooth is not something the literature has tested. What does exist is a systematic review of eight studies, of which two retrospective cohorts found chronic corticosteroid use associated with the incidence of periodontal disease, while the review's own conclusion was that there are few studies with adequate methodology to establish causation (Brasil-Oliveira 2020). Combine that with the osteoporosis data above and the plausible route runs through gum and bone rather than enamel. If worry about your teeth is part of why you are hesitating about a treatment, that is worth saying out loud to your IBD team rather than deciding alone. Nothing here is a reason to start, stop or change any medication.

The high-fluoride trap. This one is a genuine collision between two pieces of standard advice, and community threads spot it long before clinicians do. Dentists commonly prescribe high-fluoride toothpaste for people with recurrent decay and dry mouth. Separately, a systematic review of four double-blind crossover trials found that toothpaste free of sodium lauryl sulfate reduced ulcer number, duration, episode count and pain compared with the detergent-containing version, with a consistent direction of effect (Alli 2019). Many high-fluoride prescription pastes contain that detergent. If you need both, say both out loud at the same appointment, because the products that are one without the other do exist. Our mouth ulcers post covers that evidence in full, including a trial that disagrees with the review.

The calcium theory, and why it is not the answer people assume

Almost every long thread about Crohn's and teeth contains someone explaining their decay through calcium deficiency and malabsorption. It is a reasonable-sounding theory and it is mostly not how enamel works.

Enamel is laid down before a tooth erupts and contains no living cells afterwards. Once it is formed, your bloodstream cannot add mineral back to it from the inside. What happens at the surface, the cycle of demineralisation from acid and remineralisation from saliva, is driven by the calcium and phosphate already dissolved in your saliva and by fluoride, not by what you absorbed at lunch. So malabsorption while your permanent teeth were still forming, in childhood or adolescence, is a real and plausible route to thinner enamel. Malabsorption in your thirties is not going to soften teeth that are already there.

Vitamin D is a slightly different story and worth stating carefully. A narrative review traces how vitamin D was described as a central caries-preventive agent in the 1930s and 1940s before fluoride took over, and describes plausible mechanisms through tooth development and immune modulation via saliva. Its own conclusion is that the effect on caries progression and arrest remains unclear, and that prospective studies in permanent teeth are still needed (Grundmann 2025). That is a reason to have your vitamin D checked as part of routine IBD care, which is sensible anyway, and not a reason to treat a supplement as dental treatment.

The honest summary: the nutritional route is most credible for people whose disease started in childhood, and least credible as an explanation for decay that began in adulthood. If you are looking for what is driving adult-onset decay, look at acid and saliva first.

Dental work with Crohn's: extractions, implants, antibiotics and steroid cover

These are the questions people actually type, and they are the ones the ranking pages skip entirely. Autocomplete suggests dental extraction, dental management, dental precautions and dental implants for this condition. We checked the titles of the first page of results and read the highest-ranking one in full, and none of them takes on any of these four questions.

Antibiotics before or after dental work. Having Crohn's is not by itself a standard indication for antibiotic prophylaxis before dental treatment. Where antibiotics are genuinely needed, a 2025 narrative review argues the choice matters more in IBD than in the general population, because altered gut flora and frequent immunosuppression raise the risk of Clostridioides difficile infection, and because the first- and second-line dental antibiotics, amoxicillin, ampicillin and clindamycin, carry the highest risk of it. The review notes that metronidazole has a comparable antimicrobial spectrum with a lower reported C. difficile potential (Niemczyk 2025). Two cautions: this is a narrative review rather than a trial, and metronidazole has its own issues, including a significant interaction with alcohol and a distinctive metallic taste. The usable version of this is a question, not a request: is the antibiotic necessary here, and if so, is there an option with a lower C. difficile risk given my history?

Steroid cover before an extraction. A widely repeated belief, including in patient communities, is that recent steroid use means you need supplementary steroids before dental surgery. A critical review of the literature, written for dental practitioners, found that of the many reported cases of adrenal crisis after procedures, few survive critical evaluation, and concluded that patients on long-term steroid medication do not require supplementary steroid cover for routine dentistry including minor surgery under local anaesthetic. It drew a line at general anaesthesia, where supplementation may be needed depending on dose and duration (Gibson 2004). That paper is from 2004 and we have not found a more recent guideline we could open, so treat it as the direction of travel rather than the last word, and let your dentist make the call with your actual steroid history in front of them. The point is that being asked to delay a wisdom tooth for steroid cover is not automatically correct practice.

Implants. The honest answer is that nobody knows. A systematic review screened 786 studies and found six human clinical studies reporting dental implants in Crohn's disease and none at all in ulcerative colitis. Those six suggested Crohn's may contribute to both early and late implant failure, but most of the reported failures came with other risk factors and other systemic disease alongside. The review's own conclusion was that more data are needed (Voina-Tonea 2022). Six studies is not a basis for a yes or a no, and it is certainly not a basis for a percentage.

Bisphosphonates and the jaw. If you have been treated for steroid-related bone loss, you may have read something frightening about jaw osteonecrosis before an extraction. The numbers are worth having. A nationwide Japanese study of 2,819,310 new users of antiresorptive drugs found that among the 2,664,104 treated for osteoporosis, 0.06% developed medication-related osteonecrosis of the jaw, an incidence of 22.9 per 100,000 person-years. Among those treated at cancer doses the incidence was 1,231.7 per 100,000 person-years, more than fifty times higher. The strongest associated factor was poor oral condition, including tooth extraction (Ishimaru 2022). A 2025 review notes the list of implicated drug classes is growing beyond bisphosphonates and denosumab, and includes corticosteroids (Jawad 2025). The practical message is the reassuring one: at osteoporosis doses this is rare, and the single best thing you can do about it is have your mouth in good order before you need an extraction, not avoid treatment.

Is any of it reversible?

Partly, and the split is worth being precise about because it determines where your effort should go.

Gum inflammation can improve, and there is now trial evidence in this population. A registered study of 72 participants across four groups gave standard non-surgical periodontal therapy to those with periodontitis and remeasured at three months. In the group with both IBD and periodontitis, periodontal measures improved significantly, and so did salivary interleukin-6, interleukin-17 and TIM-3, plus serum C-reactive protein. Serum cytokines did not change (Bulut 2026). Read that as encouraging but early: 18 people per group, three months, surrogate markers rather than bowel outcomes, and no claim at all that treating your gums treats your Crohn's.

Enamel that has worn away does not come back, and neither does lost bone. Early surface demineralisation can be arrested and partly remineralised. A hole, a fracture line or several millimetres of lost attachment cannot. This is the whole argument for a dental review sooner rather than later, and it is also why the advice to brush harder is actively counterproductive on eroded enamel.

The cost and access problem, which is also a clinical problem

Dentistry is where chronic illness and money collide most visibly, and it is measurable.

In the largest survey of this, 1,108 patients with IBD and 3,429 matched controls answered questions about oral health and dental spending. About 30% of patients reported problems with oral lesions, with Crohn's patients having 46% higher odds of them than colitis patients and more often in a generalised form. Self-reported severe periodontitis raised the odds of oral lesions roughly 2.3-fold. Patients needed dental treatment more often and spent more: compared with controls, the odds of having spent at least 3,000 Danish kroner, around 440 US dollars, in the past twelve months were 27% higher for ulcerative colitis and 89% higher for Crohn's (Bertl 2024). That study was funded by the Novo Nordisk Foundation and the Eklund Foundation, and its measures are self-reported, which matters: people who notice one oral problem are more likely to report another, so part of the 2.3-fold association could be reporting behaviour rather than biology.

And the single most striking number in it: only about 12.5% of those patients had ever been informed by their physician about IBD-related oral lesions, and about 10% had received treatment for them.

The Swedish register data point the same way for treatment received. Across 2,085 patients with Crohn's and 3,161 with ulcerative colitis, Crohn's patients had significantly more procedures overall, most pronounced for removable dentures at 65% more, fillings in front teeth at 52% more, and endodontic treatment at 46% more (Johannsen 2015).

Community threads add one thing no study measures: the shame. People describe avoiding the dentist for years specifically to avoid being lectured, describe being told to change their diet by clinicians who had not read their history, and describe cleanings refused unless a more expensive treatment was accepted first (r/CrohnsDisease thread). One long thread also contains the useful counterweight: someone with Crohn's for over thirty years and no dentist for seventeen of them, whose pre-operative dental examination found teeth and gums in good condition (r/CrohnsDisease thread). This is a raised risk across a population, not a sentence on an individual.

One commenter in the UK thread offered a theory that acknowledging IBD as a cause of dental problems would oblige the state to fund dental care, which is why it goes unacknowledged. We have no way to verify that and are not asserting it, but it is a fair description of how the incentive looks from a waiting room.

What to tell your dentist, and what to bring

The recurring version of this question in patient communities is not "what is wrong with me" but "how do I get taken seriously without a fight". A short, specific handover works better than an explanation of Crohn's disease.

Worth saying, in roughly this order:

1. The diagnosis and where the disease is. Upper gastrointestinal or small bowel involvement changes the reflux and nutrition picture.
2. Your current medications, in full, including biologics and immunosuppressants. This is the item most likely to change what your dentist does.
3. Any corticosteroid in the past twelve months, with rough dose and duration. Relevant to bone and to surgical planning, even though routine dentistry under local anaesthetic does not need cover (Gibson 2004).
4. Whether you have reflux or vomiting, and how often. This is the single best predictor of erosion, and it is the thing dentists most often guess wrong about.
5. Any previous antibiotic reaction, including a flare or C. difficile after a course. It changes the prescribing calculation (Niemczyk 2025).
6. That you may need the bathroom mid-appointment. People report this being accommodated readily once mentioned, and dreaded for years when not. Ask about a signal and a pause.
7. That you want a recall interval based on your risk, not the default. Several of the studies above support shorter intervals in this group.

What to bring: a dated list of medications, a note of your last bone density scan if you have had one and the fact that you have not if you have not, and, if your dental problems seem to come in bursts, a rough timeline. Something as simple as a chart showing your worst symptom weeks against the dates you noticed a new dental problem is more persuasive than an adjective, and it is the sort of thing a tracker like Clairop exists to produce as a one-page summary. For how to build a handover a clinician will actually read in a ten-minute slot, see symptom tracker for doctor.

And one thing worth asking your gastroenterology team rather than your dentist: whether you are due a bone density scan. Only about one in ten at-risk patient-years in that Danish cohort was followed by one (Lo 2020).

A worked example: two people, one year

Both are 34, both have ileal Crohn's, both brush twice daily and floss. Both are told at their annual check that they have new decay.

Person A has had four courses of prednisone in three years, wakes with a sour taste and a burning throat most nights, and takes two medicines that both appear in the dry-mouth literature. Their new decay is at the gumlines and on the biting edges, their front teeth look thinner in photographs than they did five years ago, and their gums bleed when the hygienist probes despite almost no plaque. Their dentist takes the reflux history, notes the pattern as erosion plus decay rather than decay alone, prescribes a fluoride regime, asks them to raise the nocturnal reflux with their gastroenterology team, and shortens the recall to four months. Their IBD team adds a bone density scan, unprompted only because Person A asked.

Person B has been on a stable biologic for four years, has no reflux, has never had a steroid course, and has one new cavity between two back teeth. Their gums are healthy. Their decay is in the place decay normally happens, at the age it normally happens, and the useful answer is that this one is probably not their Crohn's. Deciding it must be would have cost them a conversation about flossing technique they actually needed.

The difference between them is not how hard they brush. It is acid, steroids and saliva, all three of which are findable by asking. That is the practical value of separating these routes rather than filing everything under "Crohn's ruins your teeth".

Myths worth retiring

"Crohn's causes cavities, it is well established." It is not. Three of eight studies found no difference in caries indices, a fourth found none on its main index, one found numerically fewer in the IBD group, and both pooled estimates carry arithmetic we could not reconcile (Marruganti 2021, Zhang 2025). The gum finding is the solid one.

"Gum disease and IBD are strongly linked in both directions." In the direction most often quoted, gum disease raising IBD risk, three meta-analyses agree the association holds for ulcerative colitis and not for Crohn's (Wang 2024, Aimetti 2026).

"It is the calcium malabsorption." Only if it happened while your permanent teeth were forming. Enamel has no blood supply and cannot be remineralised from the inside in adulthood.

"You need antibiotics before dental work because you are immunosuppressed." Crohn's alone is not a standard indication, and in this population the antibiotic itself carries a risk worth weighing (Niemczyk 2025).

"Recent steroids mean you cannot have an extraction without steroid cover." The dental review of this literature says routine dentistry and minor surgery under local anaesthetic do not require it (Gibson 2004).

"Implants fail in Crohn's." Six studies exist, all with confounded failures, and none in ulcerative colitis at all (Voina-Tonea 2022).

"Treating your gums will help your Crohn's." One small study showed surrogate inflammatory markers moving in the right direction after periodontal treatment (Bulut 2026). That is a long way from a clinical benefit, and nobody has shown one.

"If your teeth are bad you must not be brushing." In every study that measured it, plaque scores were the same as controls while gum inflammation was worse (Koutsochristou 2015, Haznedaroglu 2023).

When to see a doctor or dentist promptly

Book with a dentist promptly, rather than waiting for your routine check, for any of these:

• A mouth ulcer or any sore patch that has not healed within three weeks. This is the standard threshold for an oral cancer check and it is not negotiable.
• Gums that bleed spontaneously rather than only when probed, or a tooth that has become loose or feels higher than its neighbours.
• Facial swelling, pain on biting that keeps you awake, or a bad taste that will not shift. These suggest infection, which matters more if you are on an immunosuppressant.
• A visible notch or thinning at the gumline, or front teeth that are becoming translucent at the edges. Erosion is much easier to slow than to repair.
• Any planned extraction or implant while you are on, or recently on, a bone medication or a steroid course.

Contact your IBD team promptly, not your dentist, for blood in your stool, unexplained weight loss, fever, symptoms that wake you at night, new anaemia, symptoms starting after the age of 50, or a family history of bowel cancer or IBD alongside new bowel symptoms. If a new symptom outside your gut is worrying you, our guide to how to tell if you are in a Crohn's flare covers what does and does not signal active disease, and does smoking make Crohn's worse covers the modifiable factor with the largest effect on disease course, which is also bad for your gums.

The honest bottom line

Can Crohn's disease affect your teeth? Yes, and the part that is best established is not the part you have been reading about. Your gums are more inflamed than your plaque levels justify, your jawbone is a legitimate concern, and you will probably receive more dental treatment over your life than someone without the disease. Whether your enamel itself suffers from the disease as opposed to from acid, dry mouth and steroid courses is unresolved, and the people telling you otherwise with a confident number are quoting figures that do not survive being checked.

None of that is a reason to brush harder, and all of it is a reason to be specific. The three questions that will do more for your teeth than anything else are: is something acidic reaching my mouth, is my mouth dry and which medicine is doing it, and when did anyone last look properly at my gums and my bone. Those are answerable, unlike the percentage everyone is arguing about.