The susceptible period of dental caries is from 2 to 14 years old, and the damage of dental caries will not only cause the loss of teeth, affect the chewing function and permanent teeth, but also bring about the systemic effects, such as affecting the nutritional intake of children, affecting the pronunciation, and causing the focal infection of other tissues of the body by the focal teeth, etc. Therefore, we should start to prevent the occurrence of dental caries from childhood and pay attention to the dental hygiene and health care of children: 1. Therefore, the pregnant woman should pay attention to the intake of calcium, because the fetus needs a lot of calcium for the development of teeth, bones and nervous system, and the embryo of milk teeth and part of permanent teeth has been formed in the alveolar bone as early as the fetus period. Second, the correct feeding habits 1, do not contain the nipple to sleep or eat before bedtime Whether breastfeeding or non-breastfeeding, do not let the child develop the habit of containing the pacifier or mother’s nipple to sleep, older children should not develop the habit of eating before bedtime. If you nurse or eat before bedtime, the milk and food in the mouth will provide favorable conditions for the growth of bacteria, and the fermentation of food residues and the action of bacteria will eventually produce acid, which is the most powerful corrosive agent to destroy tooth enamel and easily cause tooth decay. The correct method is to feed water to the child after breastfeeding to clean the mouth, and if you eat something before bedtime, you should brush your teeth in time, and you can’t eat again after brushing your teeth. 2.Prohibit mouth-to-mouth feeding Many parents, especially the elderly, like to try the temperature of food in their own mouth before feeding it to their children, which is actually very wrong, and it is easy to infect the caries-causing bacteria or even the disease germs to children, causing serious consequences. 3.Limit the intake of sweet food Most of children’s diet is sweet, sweet food contains sugar, sugar is easily decomposed by bacteria and produce acid, so as to create conditions for the production of corrosive acid. Therefore, children should be limited to eat sweets, tell children to rinse their mouths or drink some water after eating sweets, do not let the food residue in the mouth. Third, develop the good habit of brushing teeth carefully After the milk teeth erupt, you can start brushing teeth, starting from parents to brush the child’s teeth, and gradually transition to the child’s own brushing teeth. After the age of 6, you can choose toothpaste with fluoride. If the child brushes his own teeth, then parents must check after the child brushes to ensure the effect of brushing. Fourth, regular oral health checkup It is recommended that children go to professional dentistry for checkup every 3~6 months, because professional dentists can better check children’s teeth, discover problems that parents usually can’t find, and give parents more professional oral health guidance. At the same time, we will use professional methods to carry out preventive treatment for dental caries, such as full-mouth fluoride application and fossa closure.