Scaling generally refers to supragingival scaling, pigmentation, calculus, etc. caused by black teeth can be washed away, but caries caused by can not be washed away. 1. Gingival scaling is a common operation in dentistry, which is simple and has no side effects. If the patient’s teeth are black because of smoking, long-term coffee drinking and other pigmentation, dental calculus, plaque caused by dental plaque, then the doctor on the gingival scaling can be washed away, so as to achieve the purpose of whitening teeth, dental health has certain benefits. 2. It is worth noting that if the black teeth are caused by caries, the gingival scaling can not wash away the black parts of the teeth. Clearly caries caused by black teeth, can be prescribed with fluoride, silver ammonium fluoride and other drugs to control the progress of the disease, serious cases of composite resin filling, inlay restoration and other treatments. It is recommended that people with black teeth should go to the doctor for examination, and follow the doctor’s instructions after clarifying the specific condition, and should not use medicines or prescriptions indiscriminately on their own. Daily need to strengthen oral care, timely brushing and rinsing after meals, should also be reasonable use of dental floss.