Longitudinal root fracture of a single rooted tooth usually requires extraction; longitudinal fracture of a mandibular molar can be selected for root amputation according to the condition of the tooth to preserve the normal root. Longitudinal root fracture is mainly caused by anatomical factors, diet, external force, etc., which leads to longitudinal fracture of the root of the tooth, and this type of fracture usually cannot be preserved, so longitudinal fracture of the root of a single tooth usually needs to be extracted; mandibular posterior teeth usually have 2 roots, and if the root bifurcation angle is large, and the alveolar bone does not have any obvious resorption, root amputation can be considered to preserve the normal root of the tooth after endodontics, but it is usually more expensive. The maxillary posterior root bifurcation angle is small, adjacent to the maxillary sinus, usually be extracted. It is recommended to go to the dentistry department of a regular hospital and be examined by a physician to determine the treatment plan.