If the fissure is shallow and only reaches the enamel or dentin, it can be repaired directly; if the depth of the fissure reaches the nerve or spontaneous pain occurs, it can be directly endodontically repaired, and then crown repaired at a later stage. 1. Filling repair: if the fissure is shallow, the fissure only reaches the enamel or dentin, and there is no pain or there is pain from hot, cold, sour and sweet stimulation, in this case, firstly, the fissure will be smoothed out, and then, according to the situation, choose composite resin restoration or composite resin restoration after cushioning. 2. Root canal treatment: the tooth hidden crack deeper to reach the tooth nerve or spontaneous pain, this situation needs to be root canal treatment of the tooth, after two weeks of observation, if there is no pain and then crown restoration, to prevent the tooth from splitting. If you have a cracked tooth, go to the hospital in time and choose the best treatment plan after the professional doctor’s examination.