Small black spots on teeth may be related to pigmentation, calculus, caries and other reasons. 1. Pigmentation: When long-term smoking, drinking strong tea and eating foods with high melanin content will lead to pigmentation on the surface of the teeth, resulting in the appearance of black spots. 2. Calculus: If you don’t clean your mouth properly, it can also lead to the formation of calculus from residual food in your mouth, resulting in the appearance of small black spots on your teeth. 3. Dental caries: pre-decayed tooth enamel can be damaged by bacteria, which can also lead to the appearance of small black spots on the teeth. There are many reasons why there are small black spots on the teeth, patients should pay attention to maintain oral hygiene in the daily life, eating logistics brushing. If the problem of black spots on teeth worsens, you should go to the hospital for examination and treatment.