After growing cavities, the teeth will not grow back well because teeth are non-renewable tissues, and once cavities appear, they must be remedied in time. Tooth decay is the appearance of cavity in the tooth, you need to go to the regular hospital dentistry department for examination and take dental film to clarify the location, depth and pulp cavity of the cavity. If the cavity is far from the pulp cavity, the necrotic tissue inside the cavity can be removed and then filled with cotton ball with anti-inflammatory medicine directly, the pulp cavity is located inside the tooth, if the cavity is close to the pulp cavity, after removing the necrotic tissue, it can be cushioned with cushion material and then filled with filler. Since the tooth tissue cannot be repaired after destruction, the tooth should be protected. To prevent tooth decay: 1. Develop good brushing habits to reduce the bacteria and dental bacteria adhering to the tooth surface, and the correct brushing method is once in the morning and once in the evening. After meals, you can rinse your mouth with water to ensure the cleanliness of your mouth. 2, eat less food containing more sugar, oral bacteria often use the fermentation of sugar to produce acid to corrode teeth, so in daily life many people, especially children like to eat sweets, to prevent tooth decay should try to eat less sweets, especially before going to bed must not eat sugar, snacks, etc. In addition, fluoride prevents tooth decay, fluoride can play a role in enhancing the structure of teeth and bones, and also has the role of inhibiting the growth of bacteria and acid production, when choosing toothpaste, try to choose toothpaste containing fluoride. Tooth decay should be treated in time to avoid affecting other neighboring teeth, and pay attention to oral hygiene in general.