Children with tooth decay have rotten and empty, which is clinically known as dental caries. In this case, it is necessary to go to the hospital in time to determine the area and depth of decay through imaging examination. The degree of decay is different, the treatment method is also different, and the filling, root canal treatment and tooth extraction can be carried out. 1, the decay is limited to the enamel: if the decay is only limited to the enamel, the rotten and empty tissue is less, and the dental nerve is not damaged, the decayed part can be removed thoroughly and the dental tissue can be disinfected. After the cleaning and disinfection is finished, fill the tooth with artificial material, that is to say, fill the tooth; 2, the caries breaks through the enamel and dentin: if the caries hole is too big and the tooth nerve is also damaged, in this case, root canal treatment is needed, after the infection is completely removed, then fill the tooth with root canal medicine, if the tooth nerve of the child is not yet well developed, root tip induction can be carried out first. Actively control the inflammation and review again when the baby teeth are replaced by permanent teeth to observe whether the permanent teeth can erupt normally; 3. Severe pulp destruction: If the degree of destruction of the baby teeth has been observed to be deep into the pulp after the imaging examination, and it is not very meaningful to keep the baby teeth because it is close to the time of replacing them, the affected teeth can be considered whether to be extracted for treatment. After the treatment of tooth decay in children, we should avoid the intake of too sweet food, help children to clean their mouths in time and brush their teeth regularly and regularly. In addition, you should follow up regularly after the treatment to check the recovery of the affected teeth and the health condition of other teeth in the mouth to avoid the normal eruption of permanent teeth caused by too much decay of the baby teeth.