The tooth split half solid half lost, mainly related to external damage, the patient should go to the hospital in time. If the depth is not deep, it can be filled directly or made into a porcelain crown to protect the tooth; if the middle depth is split, consider extracting the tooth or making a crown after root canal treatment. 1. Not deep: the depth of splitting is not deep, the direction is oblique splitting, if it is only mild to moderate soreness, no biting pain and spontaneous paroxysm, you can consider retaining the tooth. After the professional dentist fills the tooth or pacifies the pulp, a metal porcelain tooth protection crown can also be made to avoid splitting again. If there is significant pain, hot and cold stimulation pain, biting pain, etc., the tooth usually needs to be filled and crowned after root canal treatment. 2. Deep cleavage: If the cleavage is deeper in the center, it is recommended to combine with X-ray film. If there is no obvious inflammation in the root, you can consider using half of the crown to make a full crown after root canal treatment, or you can use fiber post or metal post to increase retention force. A splintered tooth is recommended to be seen promptly to avoid delay. Patients are also advised to develop good oral habits and not to bite hard things with their teeth.