Does xylitol gum prevent tooth decay?

Possibly in children, and the reviews do not agree on it. The most careful one, a Cochrane review of 10 trials with 5903 people, found a benefit only for fluoride toothpaste with 10 percent xylitol: 13 percent fewer caries over 2.5 to 3 years than fluoride toothpaste alone, in 4216 children, on low-quality evidence. It had no separate estimate for gum. A 2024 meta-analysis of 15 trials in 6325 children and teenagers found xylitol prevented caries against placebo or nothing, and a 2024 review of 9 trials said the effect cannot be confirmed.

Unsettled. The disagreement has a clear source. The reviews picked different trials, most of the trials are old or carry moderate to high risk of bias, and doses, ages and follow-up vary from one to the next. Cochrane judged everything other than the toothpaste too weak to say whether xylitol lozenges, tablets, wipes or syrup prevent caries in infants, children or adults.

What the trials found

Gum in children

A 2024 systematic review of 15 trials in children found that all 10 xylitol gum studies reduced caries compared with no treatment or a placebo gum sweetened with another polyol. The effect was clinically meaningful where children started with high or moderate caries. Five of 6 studies of xylitol candy found no effect. The review did not pool its results, rated the articles fair or low in quality, and comes from the Turku group that has studied xylitol for decades.

Xylitol against ordinary sugar-free gum

This is the fair comparison, because chewing any sugar-free gum may help on its own. A 2025 review from the same group found fewer caries with xylitol gum than with sorbitol gum in 3 of 5 caries trials. In the 2024 meta-analysis, sorbitol also beat placebo or nothing, with a standardized difference of 0.10 against 0.50 for xylitol. So part of the benefit may come from chewing and from replacing sugar.

Plaque, which is a step before decay

A 2025 meta-analysis of 13 treatment arms found that xylitol sweets in gummy or candy form lowered the plaque index by 0.41 points and plaque weight by 7.5 mg compared with controls. Plaque is a risk factor for caries, and less of it does not by itself show fewer cavities.

Mothers and babies

One trial inside a 2024 Cochrane review gave mothers xylitol instead of chlorhexidine. Their children had about 2.4 fewer decayed, missing or filled baby teeth, an interval from 0.7 to 4.1, on low-certainty evidence. One trial is a thin base.

Who should be careful

Not for everyone. Large doses act as a laxative. In a randomized double-blind trial of 64 young adults, a single 35 g dose of xylitol in water increased watery stools, and 50 g also caused nausea, bloating and colic. That was a single dose drunk at once, which is the harshest way to take it.

There is also an open heart question. In 2149 patients having planned cardiac checks, those in the highest third of fasting blood xylitol had a hazard ratio of 1.57 for heart attack, stroke or death over three years, with an interval of 1.12 to 2.21. That is observational. Blood xylitol is partly made by the body, and intake was not measured, so this is a signal and not proof of harm from gum.

What expert bodies say

The EU authorizes the claim that chewing gum sweetened with 100 percent xylitol reduces dental plaque, a risk factor for caries in children. It is a plaque claim, not a caries claim. A second EU claim, that foods or drinks made with sugar replacers instead of sugar help maintain tooth mineralisation, covers sorbitol, erythritol and others just as much as xylitol. In the US, foods sweetened with xylitol and the other listed sugar alcohols may carry the FDA claim that they do not promote tooth decay, which is weaker than preventing it. The evidence review for the US Preventive Services Task Force found the evidence on xylitol for children under 5 limited, while topical fluoride reduced caries.

How we searched

What would change this answer

• A large, well-blinded trial of xylitol gum against sorbitol gum in children, with cavities as the outcome. No such trial is registered.
• A Cochrane update that gives gum its own estimate. The 2015 review had none.
• A dietary study of xylitol intake and heart events, which would show whether the blood signal has anything to do with what people chew.

More on xylitol itself is on the xylitol page.

Sources

1. ev-xtd-01 · Meta-analysis or systematic review · Cochrane systematic review and meta-analysis of randomized trials · n = 4216
   The main finding of the review was that, over 2.5 to 3 years of use, a fluoride toothpaste containing 10% xylitol may reduce caries by 13% when compared to a fluoride-only toothpaste (PF -0.13, 95% CI -0.18 to -0.08, 4216 children analysed, low-quality evidence).
   
   Who: 4216 children in two trials by the same authors in the same population; review of randomized trials of xylitol products in children and adults
   Effect: prevented fraction -0.13 (95% CI -0.18 to -0.08) over 2.5 to 3 years; low-quality evidence
   Certainty: A paste, not gum; both RCTs from one group in Costa Rica, high risk of bias.
   Cochrane Database of Systematic Reviews, 2015 · checked 2026-10-07 · we read the abstract
2. ev-xtd-02 · Meta-analysis or systematic review · Cochrane systematic review and meta-analysis of randomized trials · n = 10 trials, 5903 participants
   The remaining evidence we found is of low to very low quality and is insufficient to determine whether any other xylitol-containing products can prevent caries in infants, older children, or adults.
   
   Who: randomized trials of xylitol products other than toothpaste in infants, children and adults
   Effect: low to very low quality; insufficient to determine benefit; 95% CIs compatible with both reduction and increase in caries
   Certainty: The review has no separate assessment of xylitol gum (gum is not named in the results), which is a gap specifically for the page's question.
   Cochrane Database of Systematic Reviews, 2015 · checked 2026-10-07 · we read the abstract
3. ev-xtd-03 · Meta-analysis or systematic review · systematic review and meta-analysis of RCTs and controlled clinical trials · n = 6325
   Results of the meta-analysis showed that both xylitol (standardized mean difference [SMD]: -0.50, 95% confidence interval [CI] -0.85 to -0.16, P = 0.005) and sorbitol (SMD: -0.10, 95% CI: -0.19 to -0.01, P = 0.03) had a significant effect in preventing dental caries compared to no treatment/placebo.
   
   Who: children and adolescents aged 6 to 18, randomized and controlled clinical trials of sugar substitutes, permanent teeth
   Effect: xylitol SMD -0.50 (95% CI -0.85 to -0.16), P = 0.005; sorbitol SMD -0.10 (-0.19 to -0.01); 12 of 15 trials moderate or high risk of bias
   Certainty: Includes 4 nonrandomized CTs; the xylitol form differs (gum, candy). The effect is in SMD, not in teeth.
   Journal of Dentistry, 2024 · checked 2026-10-07 · we read the abstract
4. ev-xtd-04 · Meta-analysis or systematic review · systematic review of randomized and controlled clinical trials · n = 15 articles
   In the ten evaluated xylitol chewing gum studies xylitol consumption significantly reduced caries occurrence when compared with no treatment or a placebo polyol gum.
   
   Who: children up to 18 years, prospective randomized or controlled trials of xylitol chewing gums and candies published before 2023
   Effect: 10 of 10 gum studies: significant caries reduction vs no treatment or polyol gum; 5 of 6 candy studies: no caries-reducing effect
   Certainty: No meta-analysis; article quality is fair or low; the authors are from a group that has studied xylitol for decades (Turku).
   European Archives of Paediatric Dentistry, 2024 · checked 2026-10-07 · we read the abstract
5. ev-xtd-05 · Meta-analysis or systematic review · systematic review of randomized and controlled clinical trials · n = 5 caries trials
   Plaque accumulation decreased in 6/10 studies and caries occurrence in 3/5 trials when xylitol gum was compared with sorbitol/sorbitol-containing gum.
   
   Who: prospective randomized or controlled clinical studies comparing xylitol chewing gum with a polyol control gum
   Effect: caries occurrence decreased in 3/5 trials vs sorbitol or sorbitol-containing gum; MS counts decreased in 12/14 studies
   Certainty: Answers "xylitol or just sugar-free chewing": an advantage over sorbitol exists, but only in some of the RCTs. The same group of authors.
   BMC Oral Health, 2025 · checked 2026-10-07 · we read the abstract
6. ev-xtd-06 · Meta-analysis or systematic review · systematic review of clinical trials · n = 9 trials
   According to the present findings, the preventative effect of xylitol against dental caries cannot be confirmed.
   
   Who: nine clinical trials in humans of xylitol for caries prevention and Streptococcus mutans
   Effect: efficacy not fulfilled conclusively; preventive effect cannot be confirmed
   Certainty: Discrepancy with 38762077 and 38430364: different selection and no meta-analysis. Show on the page as a discrepancy.
   Journal of Clinical and Experimental Dentistry, 2024 · checked 2026-10-07 · we read the abstract
7. ev-xtd-07 · Meta-analysis or systematic review · systematic review and meta-analysis of randomized controlled trials · n = 13 treatment arms
   A quantitative meta-analysis of 13 treatment arms of the included studies showed that xylitol-laced sweetssignificantly decreased the plaque index (PI) (WMD: -0.41, 95% CI: -0.62, -0.20, P < .001) and the quantity of plaque accumulation (WMD: -7.46 mg, 95% CI: -13.38, -1.53, P = .014) compared with thecontrol groups.
   
   Who: randomized controlled trials of xylitol-laced sweets and dental plaque, searched to July 2024
   Effect: plaque index WMD -0.41 (95% CI -0.62 to -0.20); plaque amount WMD -7.46 mg (-13.38 to -1.53)
   Certainty: Plaque is an intermediate endpoint, not caries.
   International Dental Journal, 2025 · checked 2026-10-07 · we read the abstract
8. ev-xtd-08 · Meta-analysis or systematic review · systematic review for USPSTF · n = 32 studies
   Evidence on other preventive interventions was limited (education, xylitol) or unavailable (silver diamine fluoride), and no study directly evaluated primary care dentistry referral vs no referral.
   
   Who: children younger than 5 years, 32 studies (19 trials) reviewed for USPSTF
   Effect: topical fluoride: caries increment -0.94 (95% CI -1.74 to -0.34); xylitol: limited evidence
   Certainty: Review for a body, not a recommendation; xylitol here is compared with fluoride, where the evidence is firm.
   JAMA, 2021 · checked 2026-10-07 · we read the abstract
9. ev-xtd-09 · Randomized controlled trial(s) · Cochrane systematic review of randomized trials (single-trial estimate) · n = 113
   Xylitol compared with CHX antimicrobial treatment: We are very uncertain about the effect on caries presence in primary teeth (RR 0.62, 95% CI 0.27 to 1.39; 1 trial, 96 participants; very low-certainty evidence), but we observed there may be a lower mean dmft with xylitol (MD -2.39; 95% CI -4.10 to -0.68; 1 trial, 113 participants; low-certainty evidence).
   
   Who: children of mothers given xylitol or chlorhexidine antimicrobial treatment, one trial
   Effect: mean dmft -2.39 (95% CI -4.10 to -0.68); caries presence RR 0.62 (0.27 to 1.39), very low certainty
   Certainty: The number is from a single RCT within the review, hence B.
   Cochrane Database Syst Rev, 2024 · checked 2026-10-07 · we read the abstract
10. ev-xtd-10 · Randomized controlled trial(s) · randomized double-blind placebo-controlled crossover · n = 64
    Also 35 g of xylitol increased significantly bowel movement frequency to pass watery faeces (P<0.05).
    
    Who: 64 healthy volunteers aged 18 to 24, single bolus doses of 20, 35 and 50 g xylitol in water
    Effect: 35 g: more bowel movements with watery feces (P<0.05); 50 g: more nausea, bloating, colic, watery feces vs 45 g sucrose
    Certainty: A bolus in water on an empty stomach is the worst scenario; in RCTs with chewing gum the doses are a few grams a day.
    Eur J Clin Nutr, 2007 · checked 2026-10-07 · we read the abstract
11. ev-xtd-11 · Observational data · prospective cohort with mechanistic studies · n = 2149
    Subsequent stable isotope dilution LC-MS/MS analyses (validation cohort) specific for xylitol (and not its structural isomers) confirmed its association with incident MACE risk [third vs. first tertile adjusted hazard ratio (95% confidence interval), 1.57 (1.12-2.21), P < .01].
    
    Who: stable patients undergoing elective cardiac evaluation (validation cohort)
    Effect: third vs first tertile adjusted HR 1.57 (95% CI 1.12 to 2.21) for incident MACE
    Certainty: Blood xylitol is both endogenous and dietary; intake was not measured; the doses in the drink study (30 g) are much higher than in gum. A signal, not evidence of harm.
    European Heart Journal, 2024 · checked 2026-10-07 · we read the abstract
12. ev-xtd-12 · Position of an expert body · regulatory register entry · n = —
    POL-HC-6266 Chewing gum sweetened with 100% xylitol Chewing gum sweetened with 100% xylitol has been shown to reduce dental plaque. High content/level of dental plaque is a risk factor in the development of caries in children -/- Authorised
    
    Who: EU Register of nutrition and health claims, claim POL-HC-6266
    Effect: authorized; applies to gum sweetened with 100% xylitol
    Certainty: A claim about plaque, not directly about caries; there are no conditions of use in the snapshot.
    EU Register on nutrition and health claims, claim POL-HC-6266, snapshot 2026-09-21 · checked 2026-10-07 · we read the dataset
13. ev-xtd-13 · Position of an expert body · regulatory register entry · n = —
    POL-HC-6466 Sugar replacers, i.e. intense sweeteners; xylitol, sorbitol, mannitol, maltitol, lactitol, isomalt, erythritol, sucralose and polydextrose; D-tagatose and isomaltulose Consumption of foods/drinks containing instead of sugar* contributes to the maintenance of tooth mineralisation * In the case of D-tagatose and isomaltulose this should read ""other sugars"" Authorised
    
    Who: EU Register of nutrition and health claims, claim POL-HC-6466
    Effect: authorized; covers xylitol, sorbitol, erythritol and other sugar replacers used instead of sugar
    Certainty: The claim is not specific to xylitol: the same for sorbitol and other substitutes. That is, the benefit comes from replacing sugar.
    EU Register on nutrition and health claims, claim POL-HC-6466, snapshot 2026-09-21 · checked 2026-10-07 · we read the dataset
14. ev-xtd-14 · Position of an expert body · federal regulation text · n = —
    (A) The sugar alcohols xylitol, sorbitol, mannitol, maltitol, isomalt, lactitol, hydrogenated starch hydrolysates, hydrogenated glucose syrups, and erythritol, or a combination of these.
    
    Who: 21 CFR 101.80, dietary noncariogenic carbohydrate sweeteners and dental caries
    Effect: xylitol listed among eligible substances, alongside sorbitol, mannitol, maltitol, isomalt, lactitol and erythritol
    Certainty: "Does not contribute to" caries, not "prevents"; same status for sorbitol.
    21 CFR 101.80, Health claims: dietary noncariogenic carbohydrate sweeteners and dental caries · checked 2026-10-07 · we read the section