目的了解河南省降氟改水打井工程水氟含量和工程使用情况。
Objective To understand water fluoride concentration and application of the fluoride lowering well digging projects in Henan Province.
地方性氟病等是由于饮用含氟水引起的，改水降氟是控制地氟病的有效方法。
Improving the water quality by reducing its fluorine content would be an effective method to control diseases caused by fluorine.
结论：改水降氟区儿童使用含氟牙膏增加了儿童的摄氟量，会引起儿童氟斑牙患病率的增加。
Conclusion: The using of fluoridated toothpaste increased the fluoride intake in the children in defluoridated areas, which caused the increasing of prevalence of dental fluorosis.
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