Tooth decay

Bacteria in plaque, the sticky layer on teeth, turn sugar into acid that dissolves the enamel and can make a hole. How often you have sugar matters a lot; brushing twice a day with fluoride toothpaste, spitting but not rinsing, protects the teeth. Untreated tooth decay is the most common health condition in the world.

Watch · Depth 1 · 65 sHow often, not just how muchTwo friends eat the same sweets, one all at once, one bit by bit all afternoon. How plaque turns sugar into acid, why how often matters, and the three things fluoride toothpaste needs.