1.Strengthen the forging and reasonable diet to enhance the body’s anti-caries ability. 2.After most of the milk teeth erupt, give children more hard and chewy food such as cookies, lean meat, soybean products, etc., which can promote the development of teeth and jaw bone. 3. Maintain oral hygiene and develop the habit of brushing teeth in the morning and evening and rinsing mouth after meals. Parents should help children brush their teeth from the time the first milk teeth come in. From the age of three, they should be taught to brush their teeth in the correct way. By the age of five or six, children should be allowed to brush their teeth independently with parental supervision. In addition, parents should check children’s oral cavity frequently to find caries in time and treat it in time to stop further development of caries. 4.Drug to prevent caries: Fluoride toothpaste is simple and easy to prevent caries, which can reduce the incidence of caries by 15% to 30%. Fluoride solution rinsing, fluoride ion introduction method. But it is not recommended to use it for babies and children who are too young, because they are too small at this time and easy to swallow by mistake. 5.Dental fluoride coating: Fluoride can release fluoride ions in the oral environment, and fluoride ions deposit enamel surface and penetrate into enamel interior to improve the anti-acid ability of enamel. In addition, fluoride ions have the role of inhibiting plaque growth and promoting enamel remineralization.