Small black spots on teeth may be pigmentation, caries, or tetracycline. 1. When there is a habit of drinking tea, coffee, smoking, etc., or the diet contains more pigment, the teeth may appear pigmentation, manifested as small black spots on the teeth, pigmentation can be scaling to alleviate the symptoms. 2. It may also be due to caries, the initial stage of caries is demineralization of the tooth, enamel is white, and then the lesion site pigmentation, localized yellowish-brown or brown, appearing small black spots. 3. Tetracycline teeth is in the development of teeth mineralization period to take tetracycline drugs, drugs can be combined into the tooth tissue, so that the teeth staining, first yellow and then brown, appear small black spots. There may be other reasons for the appearance of small black spots on the teeth, to the hospital in time for examination, it is recommended that the professional doctor according to the condition of the appropriate treatment method.