• ( Q ) What is a cavity?
( A ) A cavity is a small hole that forms inside the tooth and is caused by tooth decay. Cavities are formed when plaque build-up on the outside of the tooth combines with sugars and starches in the food you eat. This can produce an acid that can eat away the enamel on your tooth. If a cavity is left untreated, it can lead to more serious oral health problems. Remembering to brush your teeth at least twice a day and floss in between teeth at least once a day can prevent cavities.