What is tooth decay and why does it happen?
Tooth decay happens when foods with carbs (sugars and starches) are left on the teeth. Bacteria that live in the mouth digest these foods, turning them into acids. The bacteria, acid, leftover bits of food, and saliva mix to form plaque, which sticks to teeth. The acids in plaque dissolve the enamel surface of the teeth, creating holes called cavities.
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