Dark teeth may be caused by dental stains, patients should brush their teeth on time and go to the hospital for scaling or surgical treatment if necessary. It may also be caused by caries, dead pulp teeth and other diseases, patients can take medication, surgical treatment. 1. Dental stains: When patients often consume dark-colored food in daily life, such as chocolate, coffee, etc., if they do not brush their teeth, it may lead to pigmentation and dental stains. It is recommended that patients develop the habit of brushing their teeth on time. If brushing is ineffective, they can go to regular hospitals for scaling or teeth whitening techniques such as cold light whitening. 2. Caries: For black teeth caused by caries, patients can use fluoride such as tin fluoride solution and sodium fluoride glycerin paste as prescribed by the doctor. In addition, patients can also take surgical treatment, such as inlay restoration, amalgam filling surgery and other surgical methods. 3. Dead pulp teeth: dead pulp teeth can also lead to the phenomenon of black teeth, the patient’s main treatment is to take surgical treatment, mainly to take direct pulp capping, pulpotomy, endodontics, apical induction molding and other surgical methods, the specific surgical methods should be based on the doctor’s diagnosis. When patients have black teeth, if it is caused by tooth stains, patients should brush their teeth in time and seek medical treatment if necessary. If it is caused by other diseases, the patient should immediately consult a doctor and follow the doctor’s instructions for treatment.