Tooth nerve necrosis requires root canal treatment or apical induction of the tooth. Tooth nerve necrosis is tooth decay not treated in time, bacteria further infect the pulp tissue, causing pulp tissue septic necrosis, once the tooth nerve necrosis, need to carry out dental treatment as soon as possible, otherwise, the inflammation will drain pus outward through the gum or skin, forming gum abscess, or masticatory muscle gap infection, appearing face swelling symptoms. If the apical foramen of the tooth has been formed, root canal treatment of the tooth can be performed. If the apical foramen of the tooth is not formed, for this young permanent tooth, depending on the formation of the apical foramen of the tooth, apical induction molding of the tooth or apical barrier surgery can be performed. After nerve necrosis, the tooth loses the influence of the nerve and the tooth will have a black appearance and will be prone to splitting. In the case of anterior nerve necrosis, porcelain restoration is required after root canal treatment for aesthetic reasons. In the case of posterior nerve necrosis, a crown can be restored to prevent the tooth from splitting. Therefore, nerve necrosis requires root canal treatment or apical induction followed by crown restoration.