Children’s dental caries has a variety of factors, and diet, bacteria, and their own factors have a certain relationship. 1. Diet: If the diet is rich in sucrose and protein foods, the bacteria in the mouth will utilize the sucrose and protein to produce organic acids, corrode the enamel, and thus make the teeth demineralize and produce dental caries. 2. Bacteria: some bacteria, such as lactobacillus, actinomycetes, etc., can produce acidic substances with the residue in the oral cavity, resulting in demineralization of the teeth, so it is very important to clean the oral cavity, and cleaning the oral cavity on a regular basis can reduce the pathogenic bacteria in the oral cavity. 2. Self-factors: there are some self-factors, such as natural crowding and overlapping of teeth, resulting in oral cleaning difficulties. At the same time, the amount of saliva is relatively small is the cause of dental caries. Children’s dental caries and other factors, it is recommended to find caries, as soon as possible to see a doctor, follow the doctor’s instructions for treatment.