Getting a cavity isn’t something you enjoy experiencing, and yet, it happens to almost everyone at least once. Cavities occur as a result of tooth decay. Tooth decay occurs when foods containing carbohydrates such as breads, cereals, milk, soda, fruits, cakes, or candy are left on the teeth. Bacteria that live in the mouth digest these foods, turning them into acids. The bacteria, acid, food debris and saliva combine to form plaque, a whitish, sticky substance, that accumulates on and clings to the teeth and gums. The acids in plaque dissolve the enamel surface of the teeth, creating holes in the teeth called cavities. Tooth decay can affect both the enamel (the outer coating of the tooth) and the dentin (inner layer of the tooth) and in some cases extend into the pulp (nerve). Cavities can cause the enamel, protective part of the tooth, to weaken a break. Because of all the damage they can cause to your ...