Black stuff on teeth may be pigmentation, calculus and caries. 1. Hyperpigmentation: If you eat some darker colored food, such as dark chocolate, mulberry, etc., there may be food pigment attached to the teeth and lead to. Or long-term smoking and tea drinking, so that the teeth attached to the smoke stains, tea stains, etc., may also make the teeth black. 2. Calculus: If the teeth are not cleaned properly, and the food residue is calcified into calculus after too long a period of time, the phenomenon of black things on the teeth may also occur. 3. Dental caries: If the long-term cleaning is not in place, the phenomenon of dental caries may also occur, when the teeth appear caries holes, there will be the phenomenon of black things on the teeth. Therefore, it is recommended that patients develop good oral hygiene habits, if there is a toothache, odor and other obvious symptoms, should go to the hospital in a timely manner.