Children’s fillings are one of the most important means of treating dental caries. The process of filling depends on the severity of caries, which is generally categorized into mild caries, moderate caries and severe caries, and there are filling method, root canal treatment and tooth extraction. 1. Filling: no injury to the pulp and periodontal tissues. Mild caries is usually solved by filling method, including resin filling and glass ionomer filling. 2. Root canal treatment: The pulp is usually injured and requires root canal treatment. After root canal treatment, the tooth is brittle and easy to split, after which it can be restored with a crown. 3. Extraction: when serious caries cannot be retained after evaluation, extraction treatment is needed, if the extracted tooth is a milk tooth, a gap keeper can be made, if it is a permanent tooth, crown restoration can be considered after adulthood. Children should pay attention to oral hygiene, brush their teeth in the morning and evening, and rinse their mouths after meals to prevent the harm caused by dental caries as much as possible, and at the same time, they should eat less sweets.