Is vitamin A good for your teeth?

No trial has tested vitamin A by mouth for teeth or gums. A 2026 network meta-analysis of 79 randomized trials of supplements in chronic periodontitis counted vitamins in only 5 trials and does not name vitamin A among them. What exists is observational. In a pooled analysis of 4 studies, people eating more vitamin A had about 21 percent lower odds of gum disease. For tooth decay, a US survey of 5,145 adults found no independent link at all.

Unsettled. Vitamin A and gums have a consistent link in surveys and a gap where the trials should be. Surveys cannot separate vitamin A from the rest of a diet rich in vegetables, liver and dairy, and the one pooled analysis that tried to look at supplements actually contained none.

What the trials found

Two syntheses of randomized trials looked for nutritional add-ons to gum treatment. A 2023 review found 14 eligible trials testing lycopene, folate, omega-3, vitamin E, vitamin D and plant extracts, with no vitamin A arm. The 2026 network meta-analysis, covering about 3,709 patients aged 11 to 79, does not mention vitamin A, retinol or beta-carotene anywhere in its full text. We found no trial of vitamin A by mouth for enamel defects, decay or gum disease in people.

The trials that come closest are about other tissues or other routes. In a random sample of 409 male smokers in Finland from a randomized trial of beta-carotene and vitamin E, 20 mg a day of beta-carotene for 5 to 7 years made no significant difference to lesions of the mouth lining. In gum surgery for stage III periodontitis, adding retinol directly to the graft material gave a minor, clinically non-significant gain at 6 months that faded by 9 months. That is a local application during an operation and says nothing about diet.

For oral leukoplakia, white patches on the mouth lining, a meta-analysis of 8 randomized trials of agents including vitamin A, beta-carotene and isotretinoin found a risk ratio for clinical response of 1.14 (95% CI 0.72 to 1.81). The interval runs well across no effect, the agents are pooled together, and this is not about teeth.

Every estimate that can be put on one scale

Randomized trialsObservational data

The first three rows are odds from observational data and cannot show cause. None of them reports how many people per hundred had gum disease, so no absolute difference can be drawn. The last row is a chance of response, so a value above 1 favors treatment, and it is about patches on the mouth lining rather than teeth. Sources: cards ev-vatt-04, ev-vatt-07, ev-vatt-05 and ev-vatt-03 below.

Gums, in observational data

A meta-analysis of 4 observational studies found an odds ratio for periodontal disease of 0.788 (95% CI 0.640 to 0.971) with higher vitamin A intake, with high heterogeneity and signs of publication bias. Among 9,081 US adults in the NHANES survey, the third with the highest retinol intake had an odds ratio for periodontitis of 0.79 (95% CI 0.65 to 0.96) against the lowest third. A 2024 meta-analysis titled as being about supplementation pooled 6 studies that were all observational, and its odds ratio of about 0.97 (95% CI 0.94 to 1.00) only just reaches the line of no effect.

A Mendelian randomization study, which uses genes as a proxy for lifelong blood levels, found an odds ratio of 0.30 for periodontitis per unit of genetically higher retinol (95% CI 0.15 to 0.61). That points the same way, and it still tests genes rather than food or tablets.

Tooth decay

Among 5,145 US adults with dental examinations, 1,715 had caries. Once all vitamins and other factors were adjusted for, only vitamin B12 was linked with less decay, and vitamin A was not. The Mendelian randomization study also found no link between genetically predicted blood antioxidants and caries.

Who should be careful

Not for everyone. Women who are or might be pregnant, and those who are breastfeeding, are advised by the NIH not to take more than 3,000 mcg RAE (10,000 IU) of vitamin A supplements a day. Beta-carotene is not known to cause birth defects. In pregnant mice, high doses of retinoic acid, the active form of vitamin A, produced chalky, shortened incisors in the offspring. That is laboratory evidence, and it matches the human advice rather than adding to it.

Beta-carotene supplements carry their own warning. In the ATBC trial, 20 mg a day for 5 to 8 years raised lung cancer risk and mortality in male smokers, and the Food and Nutrition Board advises against beta-carotene supplements for the general population except to prevent deficiency. People taking the weight-loss drug orlistat can absorb less vitamin A and beta-carotene. One case report describes a yellow tint to the mouth lining from a very high intake of beta-carotene from food, which is harmless and can be mistaken for jaundice.

What expert bodies say

We found no position from an expert body on vitamin A for teeth or gums. The NIH Office of Dietary Supplements fact sheet on vitamin A has no passage on teeth. It sets the pregnancy limit and the beta-carotene advice described above.

How we searched

Searched: a local copy of PubMed on 7 October 2026, for vitamin A, retinol, retinoids, beta-carotene and carotenoids with teeth, enamel, caries, periodontitis, gingivitis and oral health (86 hits), for antioxidants and micronutrients in randomized trials and reviews of gum disease (about 40 screened), for vitamin A and leukoplakia (25), and for retinoids and the mouth (top 15 of 641 screened). We also searched Europe PMC for vitamin A, pregnancy and enamel defects, ClinicalTrials.gov for registered trials, the NIH Office of Dietary Supplements and the web for newer reviews. None of the included trials or reviews has been retracted.

Included: three syntheses of randomized trials, two randomized trials, two observational meta-analyses, one Mendelian randomization study, two survey analyses, one mouse study, one case report and four NIH passages.

Excluded: scoping and narrative reviews, reviews of antioxidants without a vitamin A arm, a survey analysis whose reported odds ratio sat outside its own interval, a trial of a multivitamin with plant extracts that gave no numbers, reviews of mouth sores in cancer treatment, and enamel trials of vitamin D.

What we read: abstracts, and the full texts of the 2026 network meta-analysis, both observational meta-analyses and the mouse study, with each quotation checked against the source.

What we could not get: an Indian study of pregnant women linking low vitamin A to enamel defects, known only from a news page that we could not trace to a paper, the full texts of the gum surgery trial and the leukoplakia meta-analysis, and the Cochrane review of leukoplakia treatment.

What would change this answer

A randomized trial of vitamin A or beta-carotene from food or supplements with gum or decay outcomes. None was registered on ClinicalTrials.gov when we searched.
A trial in people who are short of vitamin A, where an effect on gums would be most likely to show.
A traceable study of vitamin A in pregnancy and the child's enamel, which would test in people what the mouse study suggests.

How much vitamin A you need, and where it comes from in food, is in the vitamin A guide.

The rest of the nutrient, in one place. Vitamin A: the supplement that increased cancer in a randomized trial → What it does, how much you need, who runs short, and what too much does, with the evidence level shown on every line.

The full guide

Vitamin A: the supplement that increased cancer in a randomized trial

Sources

ev-vatt-01 · Meta-analysis or systematic review · systematic review and Bayesian network meta-analysis of randomized controlled trials · n = about 3709
A total of seven different types of NSs were included, including herbal extracts in 34 studies, antioxidants in 18 studies, probiotics in 10 studies, minerals in two studies, vitamins in five studies, multinutrients in four studies, and melatonin in six studies.
Who: patients with chronic periodontitis aged 11 to 79 years in randomized trials of nutritional supplements
Effect: 79 RCTs: herbal extracts 34, antioxidants 18, probiotics 10, minerals 2, vitamins 5, multinutrients 4, melatonin 6; no vitamin A specific estimate
Certainty: Full text searched for vitamin A, retinol and beta-carotene: no hits. Shows the trial gap rather than an effect.
International Journal of Dentistry, 2026 (Tang et al.), Effects of Nutritional Supplements Alone or as an Adjunct to Nonsurgical Periodontal Therapy · checked 2026-10-07 · we read the fulltext
ev-vatt-02 · Meta-analysis or systematic review · systematic review of randomized controlled trials, descriptive synthesis · n = 14 RCTs
Eleven studies examined supplements containing lycopene, folate, chicory extract, juice powder, micronutrients and plant extracts, omega-3 fatty acids, vitamin E, or vitamin D.
Who: adults with periodontitis receiving non-surgical periodontal therapy plus a nutritional intervention
Effect: supplements tested: lycopene, folate, chicory extract, juice powder, micronutrients and plant extracts, omega-3, vitamin E, vitamin D; no vitamin A arm
Certainty: No pooled estimate (within-group data missing). Supports the statement that vitamin A has not been trialled for gums.
Nutrients, 2023 · checked 2026-10-07 · we read the abstract
ev-vatt-03 · Meta-analysis or systematic review · systematic review and meta-analysis of randomized controlled trials · n = 8 RCTs
The pooled estimate showed a 14% greater chance of responding for those randomised to interventions compared with placebo (Risk Ratio [RR] 1.14, 95% confidence interval [CI] 0.72 to 1.81).
Who: patients with oral leukoplakia in randomized trials of chemopreventive agents
Effect: clinical response RR 1.14 (95% CI 0.72 to 1.81)
Certainty: About the mouth lining, not teeth. Pooled across agents; vitamin A specific estimate not in the abstract.
J Pak Med Assoc, 2017 · checked 2026-10-07 · we read the abstract
ev-vatt-04 · Observational data · meta-analysis of observational studies · n = 4 observational studies
The results indicated that there was a negative correlation between higher levels of vitamin A intake and the risk of periodontal disease (OR: 0.788, 95% CI: 0.640–0.971) (Fig. 2a).
Who: healthy individuals and periodontal disease patients in observational studies
Effect: OR 0.788 (95% CI 0.640 to 0.971); I2 79.1%; after trim-and-fill OR 0.734 (0.571 to 0.946)
Certainty: Best available synthesis for vitamin A and gums. Observational, high heterogeneity, publication bias detected for vitamin A.
BMC Oral Health, 2024 · checked 2026-10-07 · we read the fulltext
ev-vatt-05 · Observational data · systematic review and meta-analysis of observational studies · n = 12,875 with and 37,847 without periodontal disease
The meta-analysis of six studies investigating the effect of vitamin A on periodontal health resulted in a pooled odds ratio of approximately 0.97, with a 95% confidence interval ranging from 0.94 to 1.00.
Who: people with and without periodontal disease in 6 observational studies
Effect: pooled OR about 0.97 (95% CI 0.94 to 1.00); I2 86.93%
Certainty: Title says supplementation but all included studies are observational (Chapple, Li, Luo, Zhou, Park, Linden); the authors' conclusion about supplements goes beyond the data.
Journal of Clinical Medicine, 2024, 13(16):4775, Evaluating the Protective Role of Vitamin A Supplementation in Periodontal Health · checked 2026-10-07 · we read the fulltext
ev-vatt-06 · Observational data · two-sample Mendelian randomization with meta-analysis · n = —
The pooled OR for periodontitis risk per unit increase of retinol is 0.30 (95% CI = 0.15-0.61, p = .001, I2 = 40.3%, power = 100%). No significant associations were noted for genetically predicted circulating antioxidants and dental caries risk.
Who: GLIDE and FinnGen genetic consortia summary data
Effect: periodontitis pooled OR 0.30 per unit retinol (95% CI 0.15 to 0.61); dental caries: no significant associations
Certainty: Genetic proxy for lifelong blood retinol, not a test of diet or supplements.
J Periodontal Res, 2024 · checked 2026-10-07 · we read the abstract
ev-vatt-07 · Observational data · cross-sectional study · n = 9081
Compared with the lowest tertile, individuals in the highest tertile of retinol intake were less likely to be periodontitis (ORtertile3vs1 = 0.79, 95% CI: 0.65-0.96).
Who: US adults in NHANES 2009-2014
Effect: OR tertile 3 vs 1 0.79 (95% CI 0.65 to 0.96); non-smokers 0.63 (0.48 to 0.81)
BMC Oral Health, 2023 · checked 2026-10-07 · we read the abstract
ev-vatt-08 · Observational data · cross-sectional study with Mendelian randomization · n = 5,145
The result of Model 3 after adjusting for all vitamins and covariates indicated that only vitamin B12 was negatively associated with dental caries in other three quartiles compared with the lowest quartile.
Who: adults in NHANES with dental examinations
Effect: 1,715 with caries; after full adjustment only vitamin B12 inversely associated
Oral Health Prev Dent, 2025 · checked 2026-10-07 · we read the abstract
ev-vatt-09 · Randomized controlled trial(s) · end-point examination of a random sample within a randomized placebo-controlled trial · n = 409
No statistically significant differences were found between the study groups either in the prevalence of oral mucosal lesions or in the cells of unkeratinized epithelium.
Who: white male cigarette smokers aged 55-74 years in the ATBC trial, Helsinki
Effect: no statistically significant differences in prevalence of oral mucosal lesions between groups
Oral Dis, 1998 · checked 2026-10-07 · we read the abstract
ev-vatt-10 · Randomized controlled trial(s) · randomized clinical trial, local retinol in surgical graft · n = —
VitA/i-PRF showed a minor, clinically non-significant advantage in defect depth reduction and bone fill at 6 months, with effects diminishing by 9 months in patients with stage-III grade B periodontitis.
Who: patients with stage-III grade B periodontitis and intraosseous defects treated with M-MIST
Effect: minor, clinically non-significant advantage in defect depth reduction and bone fill at 6 months, diminishing by 9 months
Certainty: Local application during surgery, not dietary vitamin A. Abstract in corpus is the conclusion only; sample size not given there (misses: no_pmc).
J Periodontal Res, 2025 · checked 2026-10-07 · we read the abstract
ev-vatt-11 · Laboratory or animal data · animal experiment · n = —
When RA treatments were performed from E12.5 to 16.5, they were found to produce a chalky lightening and length reduction of incisors, changes more pronounced in lower incisors (Figures 1B,F).
Who: pregnant CD1 mice fed retinoic acid at 0.4 mg/g food and their offspring
Effect: chalky lightening and length reduction of incisors after exposure E12.5 to 16.5; milder with later exposure
Certainty: Mouse model, pharmacological retinoic acid. Fits the human advice to avoid high-dose preformed vitamin A in pregnancy.
Frontiers in Physiology, 2016, 7:673, Retinoic Acid Excess Impairs Amelogenesis Inducing Enamel Defects · checked 2026-10-07 · we read the fulltext
ev-vatt-12 · Laboratory or animal data · case report · n = 1
In this case, the patient's normal liver biomarkers, absence of dermal manifestations, and high intake of beta carotene-rich foods led to a diagnosis of carotenemia.
Who: one patient from Nigeria with high dietary beta-carotene intake
Effect: yellow discoloration of floor of mouth and soft palate; liver biomarkers normal
Gen Dent, 2025 · checked 2026-10-07 · we read the abstract
ev-vatt-13 · Position of an expert body · government fact sheet · n = —
Experts advise women who are or might be pregnant and those who are lactating not to take high doses (more than 3,000 mcg RAE [10,000 IU] daily) of vitamin A supplements [1].
Who: pregnant and lactating women
Effect: upper limit 3,000 mcg RAE (10,000 IU) preformed vitamin A; beta-carotene not known to be teratogenic
NIH Office of Dietary Supplements, Vitamin A and Carotenoids fact sheet for health professionals · checked 2026-10-07 · we read the section
ev-vatt-14 · Position of an expert body · government fact sheet · n = —
However, the FNB advises against the use of beta-carotene supplements for the general population, except as a provitamin A source to prevent vitamin A deficiency.
Who: general population
Effect: no UL for beta-carotene; advice against supplements outside deficiency prevention
NIH Office of Dietary Supplements, Vitamin A and Carotenoids fact sheet for health professionals · checked 2026-10-07 · we read the section
ev-vatt-15 · Position of an expert body · government fact sheet · n = —
However, the ATBC trial found that supplementation with a large amount of beta-carotene (20 mg/day), with or without 50 mg/day vitamin E, for 5–8 years increased the risk of lung cancer and mortality (mainly from lung cancer and ischemic heart disease) in male smokers [70].
Who: male smokers in the ATBC trial
Effect: 20 mg/day beta-carotene for 5-8 years increased lung cancer and mortality
NIH Office of Dietary Supplements, Vitamin A and Carotenoids fact sheet for health professionals · checked 2026-10-07 · we read the section
ev-vatt-16 · Position of an expert body · government fact sheet · n = —
Orlistat (Alli, Xenical), a weight-loss treatment, can decrease the absorption of vitamin A, other fat-soluble vitamins, and beta-carotene, resulting in low plasma levels in some patients [86,87].
Who: people taking orlistat
Effect: reduced absorption of vitamin A, other fat-soluble vitamins and beta-carotene
NIH Office of Dietary Supplements, Vitamin A and Carotenoids fact sheet for health professionals · checked 2026-10-07 · we read the section

How this page was made. Evidence was extracted from primary sources into cards, every number was re-checked against the source, and the text was written from those cards. Bioma Learn has no human medical reviewer at this time, and we say so rather than invent one. Methodology. This is information, not medical advice.