Root canal treatment for children is necessary because dental root canal treatment is to clean the root canal of the tooth with pulpitis or apical inflammation to achieve the purpose of treatment, so as to avoid destroying the alveolar bone around the root tip, which is harmful to the patient’s body and causes severe pain. 1. In severe cases of endodontics and periapical disease, it is recommended that children go to the hospital for root canal treatment to avoid infected bacteria from destroying the alveolar bone around the root tip and forming apical fistulae and abscesses. To completely remove the infected tissue in the pulp cavity, eliminate the infected pulp, reduce the chance of re-infection of the root tip by oral bacteria, to achieve the purpose of dental treatment. 2. If the child’s symptoms are more serious, there will be infection of the permanent tooth embryo below the root tip of the milk tooth, causing deformities in the enamel of the permanent tooth, or causing stagnation of the milk tooth, making it difficult for the milk tooth to erupt, which will lead to the occurrence of the symptoms of maxillary malocclusion. In addition, it is recommended that patients should pay attention to oral hygiene, avoid the phenomenon of inflammation and infection, protect the periodontium, and try not to chew food with the affected side to prevent the teeth from loosening. Spicy, cold and other stimulating foods should be avoided.