Cracked teeth do not heal themselves. Cracked teeth can be repaired with simple adjustments, resin fillings, and root canals. If the crack is too deep causing the root of the tooth to crack then it should be extracted. 1. Simple adjustment: If the crack is shallow and only located on the enamel surface, no special treatment is needed or simple adjustment is made to reduce the occlusal stress in order to avoid further expansion of the crack. 2. Resin filling: When the cracks have touched the dentin, the patient will be sensitive to cold and hot stimuli, and will feel pain even when biting hard objects. It is necessary to polish all the cracks and fill the surface of the tooth with resin. 3. Root canal treatment: If there are neurological symptoms such as cold, heat, irritation, pain, etc., root canal treatment should be carried out as early as possible, and then crown restoration should be carried out, or temporary crown restoration should be carried out before root canal treatment, and crown restoration should be carried out after root canal treatment, which will achieve better results. The method of restoration of cracked tooth should be decided according to the degree of cracking of the tooth, and the standardized treatment should be carried out under the guidance of the dentist.