After the splitting of a tooth, how long it can be used without extraction cannot be generalized, but needs to be combined with the degree of splitting of the tooth for a comprehensive judgment. Clinically, the split tooth can be divided into the following three cases, and according to the actual situation of symptomatic treatment. 1, the split tooth is only a part of individual cusps or a small part of the tooth tissue, the tooth body structure is stable, no bite or chewing pain symptoms, the split part can be crown restoration treatment, daily attention to protection, generally will not significantly affect the normal life of the large teeth. 2, the split tooth site If the tooth is in the central part of the tooth, but there is no gum swelling and pain, it can be treated by ligating firmly on both sides of the split, and then receive crown restoration treatment. 3, the tooth splitting degree is serious, the damaged tissue has involved the pulp, root tip and other parts of the tooth, and accompanied by bite pain symptoms, it is necessary to receive dental film examination to check the damage to the root tip, and then symptomatic treatment. If the tooth cannot be restored, it will need to be extracted. After the restorative treatment, in addition to good oral hygiene habits, you need to visit the dentist regularly for follow-up examinations.