There are three treatments for cracked teeth, mainly depending on the depth of the crack: first, if the crack is shallow and only invades the enamel layer, the bite can be lowered by jaw adjustment to protect the tooth and prevent the crack from deepening. Second, if the crack has been damaged to the dentin layer, the patient is likely to have sensitivity to cold and hot stimuli, it is necessary to get rid of the crack in time and perform resin filling, which can avoid further development of the crack. Thirdly, if the fracture has damaged the nerve, the tooth needs to be completely treated by root canal treatment and then crown restoration to avoid further fracture of the tooth.