饮用低氟水的儿童无论是否使用含氟牙膏，其氟斑牙患病率间没有差别。
The prevalence of dental fluorosis of the children drinking low fluorine water was no difference no matter whether using fluoride dentifrice or not.
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.
结果：儿童氟斑牙患病率，随着饮水氟含量的增加而升高，含氟牙膏使用组大于不使用组。
The survey was conducted for using of fluoridated toothpaste or not and the epidemic of dental fluorosis.
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