Objective To understand the effect of water improvement in endemic fluorosis area on caries in school boys and girls.

目的了解地方性氟中毒病区改水降氟对中、小学生龋患影响。

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Objective To ascertain the range and harm degree of the area of Endemic Fluorosis in liang he and provide scientific basic to enact countermeasure of prevention and cure.

目的查明梁河县地氟病区范围及危害程度，为制定防治对策提供科学依据。

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Objective To Study sensitive mark of biochemistry of bone metabolize of The Endemic Fluorosis by epidemiology examine and lab check up in high fluorine area of drinking water.

目的对饮水型高氟病区进行流行病学调查及实验室检测，研究地方性氟中毒患者骨代谢的生化敏感标志物。

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