What is a cavity?
A cavity is a small hole that forms inside the tooth because of 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 produces 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. Cavities can be prevented by brushing your teeth at least two times a day and flossing between teeth at least once.