FICTION: Sugar causes cavities
FACT: Bacteria that cause cavities are driven by an acidic pH. Acidic conditions in the mouth (pH below 7) cause a shift in the species of bacteria that form the biofilm (thin layer of bacteria that every person has) on the teeth. When this shift occurs, cavity-causing bacteria take over and good bacteria die out. Once the cariogenic bacteria dominate the biofilm, tooth decay sets in.
Xylitol quickly changes the pH in your mouth preventing cavities and tooth decay.