07/24/2025
What causes cavities?
As children, we’re taught that eating too much candy causes cavities, so it must be sugar that causes tooth decay, right? Actually, that’s an overly simple way of explaining the process. Sugar is more like the fuel for decay & it doesn’t just come from sweet foods. When you eat, chemicals called enzymes in your saliva break down carbohydrates into sugars. These sugars—plus the sugar compounds that occur naturally in fruit & foods sweetened with refined sugar or corn syrup—are then eaten by the bacteria in your mouth. Unless you brush or floss them away, these bacteria hang out in your mouth, consuming the sugar & excreting a waste product in the form of acid. This acid is what eats holes in your tooth enamel & the softer dentin layer underneath, causing cavities & tooth decay.
