You’ll get cavities
Let’s start with one of the best known results of eating too much sugar. The bacteria that line our teeth love to feed on simple sugars, a process that creates acid as a byproduct. This acid is created really quickly, too, within 20 seconds of consuming the sugar.
The acid then destroys enamel and creates painful holes that must be filled by a dentist to stop them from growing. Sour candies are especially bad for teeth because they already contain acid as well as sugar.