Clinical caries in infants and young children occurs in a high proportion, its onset and caries progress is more rapid, in severe cases, large pieces of teeth (blocks) collapse, affecting the chewing function of infants and young children, long-term development is not conducive to the aesthetic appearance of children, the normal psychological development of children and interpersonal communication has a negative impact. Clinical findings, the incidence of infant caries has increased in recent years. Parents are at a loss as to how to prevent caries in infants and young children. We suggest parents to do the following points, which are important for the correct prevention of infant caries. (1) Change poor feeding practices: sleeping with a bottle in your mouth; bottle-feeding high-sugar beverages; bottle-feeding after 1 year of age; unrestricted breastfeeding; snacking 3-4 times a day, etc. are all considered poor feeding practices. Immediate cessation of bottle-feeding habit will make the child uncomfortable. Gradual cessation of bottle-feeding habit can be achieved by adding water to dilute to reduce the amount of sucrose in the bottle, which can usually be accomplished in a few weeks’ time. (2) Cultivate good oral hygiene habits, regular oral examination: before the eruption of milk teeth, you should start to use cotton balls or gauze dipped in water to clean the mouth of infants and young children; after the eruption of milk teeth, we should gradually cultivate infants and young children to adapt to the toothbrush to clean the oral cavity of the sensation and interest; after 3 years of age, the milk teeth are completely erupted, and then we need to train the children to use a toothbrush to brush their own teeth. At the same time, 3~6 months to receive a professional oral examination is also very necessary. (3) Adjustment of dietary structure: Reducing excessive sugar in food and reducing the frequency of snacks for children can reduce the incidence of caries in infants and young children. High-fiber foods, which can exercise the chewing function, promote saliva secretion and strengthen the self-cleaning effect of the mouth. (4) Block the spread of caries-causing bacteria by enhancing the oral hygiene of parents and caregivers. (5) The use of fluoride: including the use of fluoride toothpaste, the application of fluoride gel and fluoride protective varnish on the surface of teeth, and rinsing of mouth with fluoride solution, etc., but it must be carried out under the guidance of a doctor. (6) Fossa sealing: the use of fossa sealing can significantly reduce the occurrence of molar symphyseal caries.