为了预防龋齿病 ,人们制造了约含氟为千分之一的氟化钠牙膏或氟化锶牙膏 ;有些城市在自来水中添加0 5～ 1× 10 - 6 的氟。但是 ,值得注意的是 ,氟化物牙膏和氟化水都只能供低氟区的居民使用 ,而高氟区居民不能使用氟化物牙膏或在饮水中添加氟。否则 ,不仅无利而且有害。据报 In order to prevent dental caries, sodium fluoride toothpaste or strontium fluoride toothpaste containing about 1 part per million of fluorine has been made; in some cities, 0-5-1x10-6 fluorine is added to tap water. However, it is worth noting that fluoride toothpaste and fluorinated water are only available to residents living in areas with low fluoride, whereas residents in areas with high fluoride can not use fluoride toothpaste or fluoride in drinking water. Otherwise, it is not only unprofitable but harmful. It is reported