The surface of the tooth loss inside is black may be caries, tetracycline, dental fluorosis and other diseases, need to take general measures for the cause of the disease, drug treatment, other treatments, surgical treatment. 1. Caries: the main symptom is the early appearance of white plaque on the teeth, with the development of the disease, it will become yellow-brown or black. Patients need to adjust their dietary structure, reduce sugar intake, and need to use fluoride such as 8% stannous fluoride solution and 75% sodium fluoride glycerin paste under the guidance of doctors. Secondly, fossa sealing and remineralization therapy can also be taken. If the tooth tissue has been obviously defective, patients need to consider silver amalgam filling, composite resin direct adhesion restoration, inlay restoration and so on. 2. Tetracycline teeth: the typical symptom is that the teeth gradually turn from yellowish gray to blackish brown. Patients need to cooperate with the doctor to use 30% hydrogen peroxide or 10%~15% urea peroxide and other drugs placed on the teeth, together with the use of cold light source irradiation. For those with serious staining, light-cured composite resin restoration and porcelain crown restoration are required. 3. Dental fluorosis: visible tooth coloring changes, can be manifested as the surface of the tooth is black inside the shedding. If the patient’s teeth do not have substantial defects, it is necessary to consider grinding, acid etching coating method and bleaching. If the teeth are already chipped, composite resin restoration is required. It is recommended that patients with black teeth should go to the hospital for consultation to clarify the specific cause and cooperate with the doctor for active treatment.