White spots on teeth may be caused by dental fluorosis, enamel demineralization and dental caries. 1. Dental fluorosis: a special kind of enamel hypoplasia caused by excessive fluoride intake during the period of dental development and mineralization. The surface of tooth enamel has white plaques formed due to abnormal mineralization, i.e. the phenomenon of white spots on the teeth. 2. Enamel demineralization: It is the phenomenon that calcium, phosphorus and other minerals in the teeth are lost after being affected by the acidic environment, and thus patients can have the phenomenon of white spots on teeth. 3. Dental caries: under the influence of a variety of factors, mainly bacteria, dental hard tissues undergo chronic progressive destruction of a disease, under the action of bacteria, enamel demineralization and remineralization may occur, so that the teeth can appear white spots. It is recommended that patients with white spots on their teeth go to the hospital in time and follow the doctor’s instructions for treatment to avoid delaying their condition.