Xylitol: modest help for teeth and ears, and a heart question

Xylitol has two findings from meta-analyses, and both are smaller than the marketing. In a Cochrane review, fluoride toothpaste with 10% xylitol cut caries by about 13% (95% CI 8 to 18%) over 2.5 to 3 years compared with fluoride-only toothpaste. That evidence is low quality, from 4216 children in two Costa Rican trials run by the same group. For lozenges, tablets, syrup and gum the review found too little evidence to judge. In three trials with 1826 healthy Finnish children at daycare, xylitol lowered the risk of an acute ear infection from about 30% to about 22% (RR 0.75, 95% CI 0.65 to 0.88), on moderate-quality evidence and at high doses several times a day. It did not help during colds or in children prone to ear infections. The Italian Society of Pediatrics does not recommend xylitol to prevent ear infections, and the EU rejected an ear health claim for xylitol gum.

What your body absorbs

• In a randomized double-blind test of 25 healthy adults given 25 g of each sugar, 12% malabsorbed xylitol against 84% for sorbitol and 36% for fructose. — 25 healthy controls, 25 g of each sugar on 3 consecutive days, hydrogen breath test (n = 25) Evidence B source
  Malabsorption rate xylitol 12%, fructose 36%, sorbitol 84% (P<0.01 sorbitol vs others); all 3 xylitol malabsorbers had symptoms

What cooking and storage change

• Food technology work found a suitable texture harder to reach in jams made with xylitol and sorbitol, and the researchers added calcium chloride. — experimental low-energy and diabetic jams, cakes and biscuits Evidence D source
  0.2 g CaCl2.2H2O added to xylitol and sorbitol jams; cold storage at 4 C improved keeping quality

What it does to your health

• A Cochrane review of 10 trials with 5903 people found that fluoride toothpaste with 10% xylitol may cut caries by 13% over 2.5 to 3 years compared with fluoride-only toothpaste, on low-quality evidence. — 4216 children in two trials by the same authors in the same population; review of randomized trials of xylitol products in children and adults (n = 4216) Evidence A source
  Prevented fraction -0.13 (95% CI -0.18 to -0.08) over 2.5 to 3 years; low-quality evidence
• A 2025 systematic review comparing xylitol gum with sorbitol gum found fewer caries with xylitol in 3 of 5 caries trials, and lower mutans streptococci in 12 of 14 studies. — prospective randomized or controlled clinical studies comparing xylitol chewing gum with a polyol control gum (n = 5 caries trials) Evidence A source
  Caries occurrence decreased in 3/5 trials vs sorbitol or sorbitol-containing gum; MS counts decreased in 12/14 studies
• A 2025 meta-analysis of randomized trials 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. — randomized controlled trials of xylitol-laced sweets and dental plaque, searched to July 2024 (n = 13 treatment arms) Evidence A source
  Plaque index WMD -0.41 (95% CI -0.62 to -0.20); plaque amount WMD -7.46 mg (-13.38 to -1.53)
• In a Cochrane review, fluoride toothpaste with 10% xylitol cut caries by about 13% over 2.5 to 3 years compared with fluoride-only toothpaste, on low-quality evidence. — 4216 children in two Costa Rican trials by the same group, 2.5 to 3 years; review of 10 trials, 5903 participants (n = 4216) Evidence A source
  Prevented fraction -0.13 (95% CI -0.18 to -0.08); other xylitol products (lozenges, tablets, wipes, syrup, gum) insufficient evidence
• In a randomized crossover trial of 20 normal-weight adults, a 33.5 g xylitol drink gave lower blood glucose and insulin than the same amount of sugar and lower total calories over the next meal. — 20 healthy normal-weight adults, 10 women and 10 men, single 33.5 g preload in 10 fl oz (300 mL) water (n = 20) Evidence B source
  Total energy intake lower with xylitol than sucrose (pTukey<0.03); glucose and insulin lower than sucrose (pHolm<0.01); insulin higher than acesulfame-K or water

Safety, limits and interactions

• 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 and bloating. — 64 healthy volunteers aged 18 to 24, single bolus doses of 20, 35 and 50 g xylitol in water (n = 64) Evidence B source
  35 g: more bowel movements with watery feces (P<0.05); 50 g: more nausea, bloating, colic, watery feces vs 45 g sucrose
• Observational data link the highest third of fasting blood xylitol with a hazard ratio of 1.57 for heart attack, stroke or death over 3 years in cardiac patients. — stable patients undergoing elective cardiac evaluation (validation cohort) (n = 2149) Evidence C source
  Third vs first tertile adjusted HR 1.57 (95% CI 1.12 to 2.21) for incident MACE
• Observational data link the highest third of fasting blood xylitol with a 57% higher 3-year risk of heart attack, stroke or death, and lab work found xylitol made platelets more reactive. — 2149 stable patients undergoing elective cardiac evaluation (validation cohort), plus 10 healthy volunteers in a drink test (n = 2149) Evidence C source
  Third vs first tertile adjusted HR 1.57 (95% CI 1.12 to 2.21) for incident MACE
• In a randomized double-blind trial of 64 young adults, a single 35 g dose of xylitol in water raised watery stools and 50 g also caused nausea, bloating and cramps. — 64 healthy volunteers aged 18 to 24, single bolus doses of 20, 35 and 50 g in water, 7-day washouts (n = 64) Evidence B source
  35 g: more bowel movements with watery feces (P<0.05); 50 g: more nausea, bloating, borborygmi, colic, watery feces vs 45 g sucrose
• A case report describes kidney and brain oxalate deposits after intravenous xylitol at up to 500 g a day, a hospital infusion route and dose far beyond food use. — one 39-year-old man with lithium-induced nephrogenic diabetes insipidus, postoperative xylitol infusion (n = 1) Evidence D source
  Maximum 500 g/day, total 2925 g intravenous; coma, acute kidney injury, oxalate crystals on biopsy

What people believe that the data does not support

• The EU authorizes the claim that chewing gum sweetened with 100% xylitol reduces dental plaque, a risk factor for caries in children. — EU Register of nutrition and health claims, claim POL-HC-6266 Evidence E source
  Authorized; applies to gum sweetened with 100% xylitol
• The EU also authorizes the claim that foods or drinks made with sugar replacers such as xylitol instead of sugar help maintain tooth mineralisation. — EU Register of nutrition and health claims, claim POL-HC-6466 Evidence E source
  Authorized; covers xylitol, sorbitol, erythritol and other sugar replacers used instead of sugar
• US rules let foods sweetened with xylitol and other listed sugar alcohols carry the FDA health claim that they do not promote tooth decay. — 21 CFR 101.80, dietary noncariogenic carbohydrate sweeteners and dental caries Evidence E source
  Xylitol listed among eligible substances, alongside sorbitol, mannitol, maltitol, isomalt, lactitol and erythritol
• Over three years of about 7.5 g polyol a day from candies in schoolchildren, erythritol reduced plaque growth while xylitol did not, against the idea that xylitol is the strongest polyol for teeth. — children aged 7 to 8 at start, school program, erythritol, xylitol or sorbitol candies for 3 years Evidence B source
  Plaque weight fell from baseline with erythritol (p<0.05); no change with xylitol or sorbitol
• The EU authorizes the claim that chewing gum sweetened with 100% xylitol reduces dental plaque. — EU Register of nutrition and health claims, claim POL-HC-6266 Evidence E source
  Authorized; applies to gum sweetened with 100% xylitol
• The EU rejected the claim that xylitol chewing gum is good for ear health. — EU Register of nutrition and health claims, claim POL-HC-8207 Evidence E source
  Non-authorized
• US rules let foods sweetened with xylitol and other listed sugar alcohols carry the FDA health claim that they do not promote tooth decay. — 21 CFR 101.80, dietary noncariogenic carbohydrate sweeteners and dental caries Evidence E source
  Xylitol listed among eligible substances

Who this works differently for

• A 2024 meta-analysis of 15 trials in 6325 children and teenagers found that xylitol prevented caries in permanent teeth compared with placebo or nothing, a standardized difference of -0.50, though most trials carried moderate or high risk of bias. — children and adolescents aged 6 to 18, randomized and controlled clinical trials of sugar substitutes, permanent teeth (n = 6325) Evidence A source
  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
• A 2024 systematic review of 15 trials in children found that xylitol chewing gum reduced caries in all 10 gum studies, with a clinically meaningful effect where baseline caries was high or moderate, while 5 of 6 xylitol candy studies found no effect. — children up to 18 years, prospective randomized or controlled trials of xylitol chewing gums and candies published before 2023 (n = 15 articles) Evidence A source
  10 of 10 gum studies: significant caries reduction vs no treatment or polyol gum; 5 of 6 candy studies: no caries-reducing effect
• In one trial within a 2024 Cochrane review, mothers given xylitol instead of chlorhexidine had children with about 2.4 fewer decayed, missing or filled baby teeth, on low-certainty evidence. — children of mothers given xylitol or chlorhexidine antimicrobial treatment, one trial (n = 113) Evidence B source
  Mean dmft -2.39 (95% CI -4.10 to -0.68); caries presence RR 0.62 (0.27 to 1.39), very low certainty
• In healthy Finnish children at daycare, xylitol cut the risk of acute ear infection from about 30% to 22% in three trials, but did not help during colds or in otitis-prone children. — 1826 healthy children attending daycare in Finland, three RCTs; children up to 12 years (n = 1826) Evidence A source
  RR 0.75 (95% CI 0.65 to 0.88); during respiratory infection RR 1.13 (0.83 to 1.53); otitis-prone RR 0.90 (0.67 to 1.21)
• A daily xylitol mouth rinse for 14 days lowered plaque Streptococcus mutans in high-caries-risk children and older adults, comparable to chlorhexidine in a small randomized trial. — 30 children aged 5 to 12 and 30 adults over 60 at high caries risk, 1 tbsp (15 mL) rinse once daily for 14 days (n = 60) Evidence B source
  S. mutans reduction with xylitol: children 0.93 log10 CFU/g, older adults 1.39 log10 CFU/g; no significant difference between groups
• In one trial within a Cochrane review, mothers using xylitol instead of chlorhexidine had children with about 2.4 fewer decayed, missing or filled teeth, on low-certainty evidence. — 113 children in one trial of a clinical intervention for the mother's dentition (n = 113) Evidence B source
  Mean dmft -2.39 (95% CI -4.10 to -0.68); caries presence RR 0.62 (0.27 to 1.39), very uncertain
• The Italian Society of Pediatrics guideline does not recommend xylitol for preventing acute ear infections in children. — children, Italian Society of Pediatrics AOM prevention guideline, evidence 2010 to 2018, GRADE Evidence E source
  Xylitol, probiotics, complementary therapies and vitamin D not recommended for AOM prevention

What is still unknown

• The same Cochrane review of 10 trials with 5903 people judged the rest of the evidence, on lozenges, tablets, wipes and syrup, too weak to say whether any other xylitol product prevents caries in infants, children or adults. — randomized trials of xylitol products other than toothpaste in infants, children and adults (n = 10 trials, 5903 participants) Evidence A source
  Low to very low quality; insufficient to determine benefit; 95% CIs compatible with both reduction and increase in caries
• A 2024 systematic review of 9 clinical trials concluded that the preventive effect of xylitol against caries cannot be confirmed, because doses, groups and follow-up varied too much. — nine clinical trials in humans of xylitol for caries prevention and Streptococcus mutans (n = 9 trials) Evidence A source
  Efficacy not fulfilled conclusively; preventive effect cannot be confirmed
• The systematic evidence review for the US Preventive Services Task Force found that evidence on xylitol for preventing caries in children under 5 was limited, while topical fluoride reduced caries. — children younger than 5 years, 32 studies (19 trials) reviewed for USPSTF (n = 32 studies) Evidence A source
  Topical fluoride: caries increment -0.94 (95% CI -1.74 to -0.34); xylitol: limited evidence

The bottom line

As a sweetener it behaves differently from sugar. In a crossover trial of 20 normal-weight adults, a single 33.5 g xylitol drink gave lower blood glucose and insulin than the same amount of sucrose, and lower total calories over the next meal. Insulin was still higher than after water or acesulfame-K. This was one acute test and says nothing about weight over time. In one 1997 food technology study, xylitol jams were harder to set and the researchers added calcium chloride. On teeth the picture is mixed. The EU allows the claim that gum sweetened with 100% xylitol reduces dental plaque, and US rules let xylitol foods say they do not promote tooth decay. In a three-year school program with about 7.5 g of polyol a day from candies, plaque weight fell with erythritol and did not change with xylitol. A 14-day xylitol mouth rinse lowered decay bacteria in 60 high-risk children and older adults about as much as chlorhexidine, a lab marker rather than cavities. In one trial of 113 children, mothers who used xylitol instead of chlorhexidine had children with about 2.4 fewer decayed, missing or filled teeth (95% CI 0.68 to 4.10), on low-certainty evidence. Who should be careful. Dose decides the gut. In 64 young adults, a single 35 g dose in water on an empty stomach caused watery stools, and 50 g added nausea, bloating and cramps. In a breath test of 25 healthy adults given 0.88 oz (25 g), 12% malabsorbed xylitol, against 84% for sorbitol. The heart question is open. In 2149 cardiac patients, the highest third of fasting blood xylitol was linked with a 57% higher 3-year risk of heart attack, stroke or death (HR 1.57, 95% CI 1.12 to 2.21). Blood xylitol there came partly from the body itself, intake was not measured, and the platelet findings came from lab work and 10 volunteers without a control group. The one case of kidney and brain damage involved hospital infusions of up to 500 g a day into a vein, which does not transfer to food. We have no evidence card on how much xylitol children tolerate, although the ear infection trials gave them high doses several times a day.

Sources

1. xyl-r2-05 · RCT
   The rate of malabsorption was 84% for sorbitol, 36% for fructose and 12% for xylitol (p < 0.01 for sorbitol versus fructose and xylitol).
   Med Klin (Munich), 1994 · checked 2026-09-29
2. xyl-r2-12 · food technology study
   The attainment of a suitable texture may be more difficult in xylitol and sorbitol jams, therefore 0.2 g CaCl2. 2H2O was added.
   Nahrung, 1997 · checked 2026-09-29
3. ev-xtd-01 · Cochrane review
   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).
   Cochrane Database of Systematic Reviews, 2015 · checked 2026-10-07
4. ev-xtd-05 · systematic review
   Plaque accumulation decreased in 6/10 studies and caries occurrence in 3/5 trials when xylitol gum was compared with sorbitol/sorbitol-containing gum.
   BMC Oral Health, 2025 · checked 2026-10-07
5. ev-xtd-07 · meta-analysis
   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.
   International Dental Journal, 2025 · checked 2026-10-07
6. xyl-r2-01 · Cochrane review
   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).
   Cochrane Database of Systematic Reviews, 2015 · checked 2026-09-29
7. xyl-r2-06 · RCT
   Plasma glucose and insulin concentrations were lower in response to xylitol compared to sucrose (pHolm < 0.01), but xylitol led to an increase in insulin compared to ace-K and water (pHolm < 0.01).
   Nutrients, 2025 · checked 2026-09-29
8. ev-xtd-10 · RCT
   Also 35 g of xylitol increased significantly bowel movement frequency to pass watery faeces (P<0.05).
   Eur J Clin Nutr, 2007 · checked 2026-10-07
9. ev-xtd-11 · cohort study
   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].
   European Heart Journal, 2024 · checked 2026-10-07
10. xyl-r2-03 · cohort plus mechanistic studies
    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].
    European Heart Journal, 2024 · checked 2026-09-29
11. xyl-r2-04 · RCT
    Also 35 g of xylitol increased significantly bowel movement frequency to pass watery faeces (P<0.05).
    Eur J Clin Nutr, 2007 · checked 2026-09-29
12. xyl-r2-11 · case report
    Our patient received a maximum xylitol dose of 500 g/day and a total dose of 2925 g.
    BMC Nephrol, 2020 · checked 2026-09-29
13. ev-xtd-12 · regulatory register
    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
    EU Register on nutrition and health claims, claim POL-HC-6266, snapshot 2026-09-21 · checked 2026-10-07
14. ev-xtd-13 · regulatory register
    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
    EU Register on nutrition and health claims, claim POL-HC-6466, snapshot 2026-09-21 · checked 2026-10-07
15. ev-xtd-14 · regulation
    (A) The sugar alcohols xylitol, sorbitol, mannitol, maltitol, isomalt, lactitol, hydrogenated starch hydrolysates, hydrogenated glucose syrups, and erythritol, or a combination of these.
    21 CFR 101.80, Health claims: dietary noncariogenic carbohydrate sweeteners and dental caries · checked 2026-10-07
16. xyl-r2-08 · RCT
    A significant reduction in dental plaque weight from baseline (p<0.05) occurred in the erythritol group during almost all intervention years while no changes were found in xylitol and sorbitol groups.
    J Dent, 2013 · checked 2026-09-29
17. xyl-r2-13 · regulatory register
    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
    EU Register on nutrition and health claims, claim POL-HC-6266, snapshot 2026-09-21 · checked 2026-09-29
18. xyl-r2-14 · regulatory register
    POL-HC-8207 Xylitol-sweetened chewing gum Xylitol is good for the health of ears. Maintains good health of the ears. Non-authorised
    EU Register on nutrition and health claims, claim POL-HC-8207, snapshot 2026-09-21 · checked 2026-09-29
19. xyl-r2-15 · regulation
    (A) The sugar alcohols xylitol, sorbitol, mannitol, maltitol, isomalt, lactitol, hydrogenated starch hydrolysates, hydrogenated glucose syrups, and erythritol, or a combination of these.
    21 CFR 101.80, Health claims: dietary noncariogenic carbohydrate sweeteners and dental caries · checked 2026-09-29
20. ev-xtd-03 · meta-analysis
    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.
    Journal of Dentistry, 2024 · checked 2026-10-07
21. ev-xtd-04 · systematic review
    In the ten evaluated xylitol chewing gum studies xylitol consumption significantly reduced caries occurrence when compared with no treatment or a placebo polyol gum.
    European Archives of Paediatric Dentistry, 2024 · checked 2026-10-07
22. ev-xtd-09 · Cochrane review
    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).
    Cochrane Database Syst Rev, 2024 · checked 2026-10-07
23. xyl-r2-02 · Cochrane review
    In three RCTs that involved a total of 1826 healthy Finnish children attending daycare, there is moderate quality evidence that xylitol (in any form) can reduce the risk of AOM from 30% to around 22% compared with the control group (RR 0.75, 95% CI 0.65 to 0.88).
    Cochrane Database of Systematic Reviews, 2016 · checked 2026-09-29
24. xyl-r2-07 · RCT
    Conclusions: Antimicrobial efficacy of xylitol and probiotic mouth rinses were comparable to that of chlorhexidine in both children and elderly.
    J Prev Med Hyg, 2022 · checked 2026-09-29
25. xyl-r2-09 · Cochrane review
    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).
    Cochrane Database Syst Rev, 2024 · checked 2026-09-29
26. xyl-r2-10 · guideline
    The use of complementary therapies, probiotics, xylitol and vitamin D is not recommended.
    Pediatr Infect Dis J, 2019 · checked 2026-09-29
27. ev-xtd-02 · Cochrane review
    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.
    Cochrane Database of Systematic Reviews, 2015 · checked 2026-10-07
28. ev-xtd-06 · systematic review
    According to the present findings, the preventative effect of xylitol against dental caries cannot be confirmed.
    Journal of Clinical and Experimental Dentistry, 2024 · checked 2026-10-07
29. ev-xtd-08 · systematic review
    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.
    JAMA, 2021 · checked 2026-10-07