Whether the broken tooth must be extracted can be decided according to the specific situation, as follows: 1, if the crown of the tooth to form a large carious cavity, you can use zinc polycarboxylate cementum cushioning after removing the decayed material, and apply composite resins, silver amalgam and other fillings. If necessary, inlay restoration can be made to restore the anatomical form and prevent the filling from fracturing or falling off.2. If the pulp is exposed in the cavity, root canal treatment can be carried out first, and metal or porcelain crown restoration can be made at last to prolong the service life of the tooth.3. If perforation occurs in the pulp chamber bottom of the molar tooth, the MTA can be applied to repair it and then make the core of the post to enhance the tooth’s retention, and then finally the crown can be restored.4. If the broken part of the pulp chamber bottom is is large, resulting in root separation and obvious loosening of the tooth, the prognosis is poor and extraction is required.