The clinical manifestations of dental fluorosis are characterized by chalky to brown plaques on the enamel erupting at the same time and, in severe cases, are complicated by parenchymal defects of the enamel. It is often clinically classified into chalky (mild), stained (moderate) and defective (severe) types according to their mild, moderate and severe severity. Dental fluorosis makes everyone lose their white teeth from childhood, which can lead to low self-esteem. The most important thing for dental fluorosis is prevention. The most fundamental prevention method is to improve the water source and reduce the fluoride content in drinking water. In addition to drinking water, the pollution of environmental fluoride in the atmosphere and food containing too much fluoride should also be treated. Specific prevention has the following three aspects: 1, careful use of fluoride toothpaste For children whose swallowing control is not yet perfect, accidentally swallowing fluoride toothpaste will increase the intake of fluoride, and excessive fluoride will easily lead to dental fluorosis. Although the use of fluoride toothpaste can effectively prevent tooth decay, but at the same time has side effects, if used improperly, it will easily lead to dental fluorosis. The line between the anti-caries effect of fluorine and the toxicity is very small, and the excessive intake of fluorine will cause the teeth to produce some spots, which is fluorosis. When it is serious, it can make the teeth yellow, rough surface and easy to be defective. 2.Living environment Changing water and stove to improve water quality can be done by changing the water source and reducing the fluoride content of drinking water. Changing the water source is to abandon the original water source with high fluoride content and find a water source with low fluoride content. To reduce the fluoride content of drinking water is to use certain chemicals or physical methods to reduce the concentration of the atmosphere in the water source. In order to prevent the atmosphere poisoning caused by soot smoked kang food, the drying method of food should be changed, while improving the stove to prevent indoor air pollution. 3.High fluorine area Excessive fluorine can only occur when it enters the body during the period of tooth development and mineralization. If you live in an area with high fluoride content in drinking water for a long time before the age of 6 or 7, even if you move to another place later, you cannot avoid the involvement of permanent teeth that will erupt later; on the contrary, if you move to a high fluoride area after the age of 7, you will not develop dental fluorosis. Children in high fluoride areas can leave the high fluoride area first, and then go back after the age of eight, and they will not develop dental fluorosis.