The best way is to establish the concept of prevention: do not add too much sugar to the milk of cow’s milk-fed children, and feed a few sips of warm boiled water after feeding to help rinse the mouth. Do not eat sugar before bedtime and do not hold the nipple at bedtime, because holding the nipple affects saliva swallowing and is not good for oral cleaning. Tooth decay should be repaired in time and no abuse of drugs. In addition, nutrition should be sufficient, healthy tooth structure needs sufficient protein, calcium, phosphorus and vitamin C, D and other nutrients, lack of nutrition will also affect the development of teeth. Singing children’s songs and picking toothbrushes helps children love to brush their teeth We advocate brushing teeth in the morning and evening and rinsing after meals. It is most important to brush teeth before going to bed because when people fall asleep, saliva secretion will be reduced, and saliva can flush away bacteria and inhibit bacterial reproduction. If you do not brush your teeth before going to bed or do not brush cleanly, the food residue will soon ferment and produce acid under the action of bacteria, plus the lack of saliva in the mouth due to sleep, which cannot dilute and neutralize the acid produced by bacteria, the teeth will be easily corroded and may cause tooth decay in a long time. Therefore, if you brush your teeth before going to bed, brush the food debris left on the teeth and the surface of the teeth, and do not eat anything after brushing, you can maintain the oral hygiene overnight.