The color of teeth and teeth should be more coordinated, but occasionally white spots appear on individual teeth or a group of teeth, that is, white spots on teeth, formed in several cases: 1, fluorosis teeth: pregnancy or under seven weeks of age living in areas with high fluoride, or coal area water containing relatively high fluoride, it is easy to cause fluorosis teeth; 2, enamel hypoplasia caused by: tooth mineralization is completed during pregnancy, so mostly seen in pregnancy caused by calcium deficiency. This enamel hypoplasia is a congenital disease; 3, late demineralization of teeth: long-term consumption of cola or other carbonated beverages, or orthodontic process does not pay attention to dental hygiene care, resulting in poor oral environment caused by demineralization of the tooth surface, mostly seen in the upper front teeth.