If your incisor is broken at the age of 13, you can choose composite resin filling, root canal treatment, apical induction molding or tooth extraction depending on the situation. 1. Composite resin filling: If only enamel or dentin is missing after the incisor is broken, you can choose composite resin filling and crown restoration to prevent the tooth from splitting. 2. Root canal treatment: If the incisor is broken and the nerve is exposed, and if the root is fully developed, root canal treatment can be performed on the tooth, and crown restoration can be performed two weeks later. 3. Root canal induced plasty: If the nerve is exposed due to a fractured incisor, and if the apical foramen is not completely closed, root canal induced plasty will be performed on the tooth in order to promote the continued development of the root. 4. Extraction: If the root of the fractured incisor is also fractured, there is little point in retaining the tooth, so it is best to have the incisor extracted, and then have a temporary tooth restored, and then have it permanently restored after the age of 18. The 13-year-old incisor knocked out, timely to the hospital to take dental apical film, and then according to the situation to choose a specific treatment program.