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为探讨不同饮水氟浓度、不同营养水平对人群龋齿的影响，分低水氟（＜０．３ｍｇ／Ｌ），适宜水氟（１ｍｇ／Ｌ）和高水氟（＞４．８ｍｇ／Ｌ）三个氟水平，每一氟水平又分正常低营养二组，共６个人群组，每组１２０人，平均年龄４６岁，调查计算了人群日总摄氟量，检查了冠面龋与根面龋。同时每组调查了８～１５岁学生１００人。结果经统计分析表明，低饮水氟地区人群的龋患率与龋患指数均明显高于其他两组。低水氟与适宜水氟组人群均无氟斑牙发生，高饮水氟组发生了严重的氟中毒。此结果证明，适宜水氟（１ｍｇ／Ｌ）能起到预防氟中毒与预防龋齿的双重作用。不同营养水平方面，只在低饮水氟２组之间表现出来，低营养组的龋患率明显高于正常营养组。
To investigate the effects of different fluoride levels and different nutrition levels on dental caries in different drinking water groups, the subjects were divided into low fluoride (<0.3mg / L), water fluoride (1mg / L) and high water fluoride (> 4.8mg / L) A fluoride level, each fluorine level is divided into two groups of normal low nutrition, a total of 6 groups, each group of 120 people, average age 46 years old, the survey calculated the total daily fluoride intake, check the coronal caries and root surface Caries. At the same time, each group investigated 100 students aged 8 to 15. Results The statistical analysis showed that caries prevalence and caries index were significantly higher in the low fluoride area drinking water group than in the other two groups. Low fluoride and fluoride water group were fluoride-free dental population, high fluoride drinking water group had a serious fluorosis. The results show that the appropriate water fluoride (1mg / L) can play a dual role in prevention of fluoride poisoning and prevention of dental caries. In terms of different nutrition levels, the caries prevalence in low-nutrition group was significantly higher than that in normal nutrition group only in low-fluoride group.