The destruction of tooth structure is known as tooth decay. It is caused when the bacteria present in the mouth acts on food debris to form acids. These acids combine with the bacteria, food and saliva to form plaque which sticks on to the teeth. The acids in plaque erode the teeth enamel resulting in tooth decay and cavities. Maintaining good oral hygiene along with regular visits to your dentist may help prevent tooth decay. To prevent tooth decay brush your teeth twice daily with a fluoride containing toothpaste. Floss your teeth daily to clean areas between your teeth. Eat a well balanced diet limiting the frequency and amount of sugar and starch used. Visit a dentist regularly for professional cleaning and checkups. Discuss with your dentist regarding the use of dental sealants or fluoride supplements to prevent tooth decay.