Evidence guide
Xylitol and Teeth: What the Evidence Really Says
Xylitol is widely used in sugar-free oral-care products, but evidence for preventing caries is not as simple as marketing suggests.
What xylitol is
Xylitol is a sugar alcohol used as a sweetener. In oral-care contexts it is often delivered in gum, lozenges or other products that also stimulate saliva.
Evidence is mixed
The ADA notes that some studies suggest cariostatic effects for xylitol and sorbitol, but overall findings are equivocal. An expert panel cited by the ADA characterized evidence for xylitol as an adjunctive caries-prevention therapy as low quality.
Why delivery method matters
Chewing gum increases salivary flow, so outcomes from xylitol gum cannot automatically be assigned to capsules or powders with different oral contact time.