氟是广泛分布在环境中的一种元素,在地壳中是第十三位含量丰富的元素(0.065%)。自从本世纪四十年代首次肯定氟有止龋效果以来,氟用作预防龋齿已被广泛采纳与应用。当前美国有一半以上的人口饮用天然含氟或人为加氟的水,这种人口的比例还在增加。此外,为了防止龋齿,氟还被用于各种投加系统,包括牙膏、牙粉、 Fluorine is an element widely distributed in the environment and is the thirteenth abundant element (0.065%) in the earth’s crust. Fluoride has been widely adopted and used as a preventive against dental caries since it was first approved in 1940s for dental caries prevention. At present, more than half of the population in the United States consume natural or fluoride water, which is still increasing in proportion. In addition, fluorine is also used in various dosing systems to prevent tooth decay, including toothpaste, dentifrice,