A cavity is a hole in the tooth that is caused by decay. The decay process starts when bacteria in the mouth feed on sugars and starches in food, producing acids that attack the tooth enamel. Over time, the enamel can break down, creating a cavity.
If you think you may have a cavity, it is important to see your dentist right away. The dentist will examine your teeth and take X-rays to determine if you have any cavities. If you do have a cavity, the dentist will recommend the best course of treatment.