1.Less snacks and candies can reduce the occurrence of dental caries, which is especially important for children, especially note that do not eat candies, pastries and other snacks before going to bed, and if you eat, make sure to brush your teeth before going to bed. 2.The gap and sulcus on the surface of teeth are the susceptible parts of caries, using composite resin for sulcus closure can achieve the effect of preventing caries or using fluoride to prevent caries. 3.Select some rough and fiber-containing food appropriately in the diet, so that the tooth surface can get good friction effect and promote the tooth surface cleaning, thus forming the good condition of anti-caries. 4.We should pay attention to reasonable nutrition and eat more foods containing calcium, phosphorus and vitamins, such as soybeans, soy products, seafood, milk, cod liver oil and fresh vegetables and fruits containing a lot of vitamins and inorganic salts. These foods are very beneficial to the development and calcification of teeth. 5, develop good oral hygiene habits, wash your hands before meals, rinse your mouth after meals, brush your teeth in the morning and evening, and choose fluoride toothpaste.