The treatment of cracked teeth is determined by the depth of the crack as follows: 1, bite hard objects or trauma-induced tooth crack, if the crack is shallow only in the enamel or dentin shallow layer, no other clinical symptoms without treatment, once the sensitivity and soreness, you can use desensitization treatment, desensitization effect is not obvious, you need to grind out the crack, fill the tooth with resin. 2, the tooth cracked to the middle or deep layer of dentin, subjective pain will be Once the crack reaches the pulp and causes severe pain, root canal treatment is needed to remove the nerve, disinfect the root canal and then tightly fill the root canal and restore the crown with a porcelain crown. 3. It is usually necessary to extract the tooth.