Objective: In order to overally get the message of the effects of water defluoridation measures and provide a new approach to the methodological research of endemic fluorosis.

• 目的：全面了解中国改水降氟措施防治饮水型地方性氟中毒的效果，探索控制饮水型氟中毒改水干预措施效果的综合评价方法。