Loose teeth need to depend on the specific cause, if it is caused by periodontal disease can be scaled, do scaling, remove local plaque calculus stimulation. Rinse the mouth with mouthwash and apply topical iodine glycerin. If the tooth is temporarily loose due to apical tooth infection, root canal treatment can be done. If the tooth has no retention value, it can be extracted under local anesthesia. Occult tooth fracture, also known as incomplete tooth fracture or microfracture, refers to a small, non-physiological crack on the surface of the tooth crown. It is often not easily detected, and superficial fissures without obvious symptoms and with normal pulp vitality can be treated to reduce the lateral splitting force and prevent the crack from deepening. A cavity can also be prepared, and the crack can be ground away and filled prophylactically if possible. Deeper cracks or existing pulp lesions can be treated with a large number of cusp bevels to completely remove the fracture-causing forces from the affected tooth and restore it with a full crown in time after treatment. In the process of endodontic treatment, the cavity of the jaw surface causes the tolerance of the crack to the force to be greatly reduced, although the occlusion has been reduced during the treatment, the tooth is very likely to split open from the crack during the treatment due to chewing and other reasons. Therefore, at the beginning of endodontic treatment, a band ring can be glued on to protect the crown. Full crown restoration should be done after endodontic treatment.