From Tammy Davenport,
Your Guide to Dental Care.
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About.com Health's Disease and Condition content is reviewed by our Medical Review Board

A. A cavity is a hole in the tooth that is caused by decay. Decay occurs when plague, the sticky substance that forms on teeth, combines with the sugars and / or starches of the food we eat. This combination produces acids that attack tooth enamel. The best way to prevent tooth decay is brushing twice a day, flossing daily and going to your regular dental check ups. Eating healthy foods and avoiding snacks and drinks that are high in sugar are also ways to prevent decay.

Photo of a Cavity