1.Prevention of caries starts from pregnancy A well-developed tooth has a solid foundation of anti-caries. In terms of improving the anti-caries power of teeth, first of all, we should ensure the various nutrients needed for the physical development and dental development during the fetal period, and timely supplement high protein, calcium, vitamins and other nutrients during pregnancy to ensure the normal development of the fetal dental embryo. Secondly, pregnant women should pay special attention to prevent the occurrence of various infectious diseases. 2.Cultivate children to develop good oral hygiene habits, because the sulcus of the newly erupted milk teeth is narrow and deep, which is easy to hide bacteria and is the site of caries. Pay attention to oral hygiene is the most crucial link to prevent caries, and children should be educated to develop good oral hygiene habits from childhood, such as rinsing mouth after meals, not eating sugar and snacks before bedtime, etc. 3.Preventing tooth misalignment is beneficial to reduce the occurrence of dental caries, tooth misalignment can make food embedment or retention, thus easy to occur caries, so to prevent the occurrence of tooth misalignment, such as the period of tooth replacement should be timely extraction of retained milk teeth and multiple teeth, repair missing teeth. 4.Balanced nutrition, less sweet food. The food for infants and children should be diversified to provide rich nutrients needed for tooth development, and also pay attention to chewing more coarse fiber food, such as vegetables, fruits, beans, lean meat, etc. The fiber in these foods can rub the tooth surface and remove the plaque attached to the tooth surface when chewing. 5.Regular oral examination Early detection of dental caries, early treatment, children are required to have oral examination once every 3~6 months. 6.Apply various fluoride products such as fluoride toothpaste, paste, water, etc., which have the effect of preventing caries. 7.Implementation of sulcus closure is a practical and effective method, which can play an effective role in caries prevention and reduce the incidence of caries by more than 90%, so that children can avoid the pain of tooth decay.