Thirteen year olds who have developed a pulpal infection can have a root canal, which is beneficial in treating the infection and preventing the pulpitis from continuing to progress. Without root canal treatment, the infection in the pulp will not be controlled and will spread to the periapical tissues, causing periapical inflammation, which may lead to tooth loss in severe cases. A thirteen year old’s tooth is a young permanent tooth and the apical foramen of a young permanent tooth is flared and not yet closed. After root canal treatment, once the infection is controlled, apical induction molding can be performed, the root can be formed again, and the bone can be deposited at the root end to close the apical foramen. This procedure can only be performed in the absence of inflammation. If the pulp is severely infected or accompanied by other symptoms, it is advisable to go to the hospital for early and regular treatment.