The correct term for a molar tooth is an incisor, and the presence of a fissure means that an occult fracture has occurred. The treatment of an occult fracture of an incisor includes elimination of the traumatized jaw, restorative treatment, and balancing of the occlusal forces, as follows. 1. Elimination of traumatized jaws: grinding of high and steep cusps and sharp marginal ridges, treatment of existing fissures and prevention of fissures in other teeth. 2. Restorative treatment: choose the method of restorative treatment according to the depth of the lesion; shallow lesions are treated with enamel adhesive light curing; medium depth lesions are prepared along the crack and restored with composite resin filling; deeper lesions, which may involve the dental pulp, need to be restored with crowns after endodontic treatment. 3. Balance the occlusal force: check the whole mouth, deal with the residual roots and crowns, missing teeth, etc., and spread the occlusal force of the whole mouth on most of the teeth, so as to prevent the occurrence of cryptic cracks on individual teeth due to overburdening. It is recommended to go to the hospital in time to receive regular treatment.