Dark teeth may be caused by caries, pulp necrosis, food pigment staining adherence, etc. You can choose filling treatment, or decolorization or veneer treatment, as well as through scaling treatment. 1. Filling treatment: If the tooth is decayed, you need to go to the hospital under the guidance of a professional dentist, which is to remove the necrotic tissues in the cavity, and then fill it, which can restore the shape of the crown. 2. Decoloration or veneer: If a single tooth is black, it means that the pulp has been necrotic symptoms, you need to go to the hospital under the guidance of a professional dentist for treatment, you can decolorize the pulp cavity, but the general effect is not very good. Full crowns or porcelain veneers can be restored, which can completely solve the problem of black teeth. 3. Scaling: black teeth can be seen in the food pigment staining adhesion, such as smoking, drinking tea, eating mulberry plums, etc. teeth will become black, this time you can visit the hospital, scaling, and maintain oral hygiene after surgery. It is recommended to the dental hospital to check the specific situation of the teeth, if there are oral diseases immediately.