The root of the tooth is black may be due to improper diet, long-term smoking and other physiological factors, or consider the calculus, caries and other diseases, patients need to take general measures for the cause of the disease, medication, surgical treatment, and so on. 1. Physiological factors: If the diet is not good, long-term smoking, may lead to local pigmentation, the root of the tooth black. Ultrasonic cleaning followed by sandblasting is recommended. Excessive pigmentation will be conducive to the attachment of plaque and other soft tartar, so the roots of the teeth black need to be dealt with in a timely manner. Daily need to maintain oral hygiene, avoid long-term smoking, can be relieved. 2. Calculus: The black root of the tooth may also be caused by calculus. Patients can combine their own situation, take the gingival scaling, subgingival scraping, and so on. During the treatment, you need to keep your mouth clean, brush your teeth and rinse your mouth. 3. caries: the roots of the teeth black is also considered to be due to caries. Patients need to be under the operation of the doctor for caries filling surgery. Once the patient appears the root of the tooth black situation, usually pay attention to good brushing and recommended to go to the regular hospital for treatment.