There are many reasons why there are small white spots on teeth, mostly seen in dental fluorosis, enamel hypoplasia and dental caries, etc. Fluorosis: Dental tissue disease caused by excessive fluoride intake during the developmental period. 1. dental fluorosis: dental enamel in the developmental period of excessive intake of fluoride led to dental tissue diseases, manifested in the enamel white to brown spots or plaques of varying degrees, can be accompanied by enamel defects. 2. dental enamel hypoplasia: due to the enamel matrix formation disorder caused by multiple white spots on the teeth. 2. enamel hypoplasia: multiple white spots on the teeth due to impaired enamel matrix formation, with a clearer perimeter and lines parallel to the enamel growth and development lines. 3. Dental caries: due to bacterial infection and other factors resulting in the destruction of the hard tissue of the teeth, white spots can appear in the early stage, with the development of the disease can appear to cold, hot, sweet, acid sensitivity, accompanied by cavities. Small white spots on the teeth may have other causes such as dental calculus, etc. It is recommended to go to a specialist hospital in time, improve the examination and standardize the treatment.