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居民患龋率和龋病的轻重,在一定程度上取决于地理的特点和饮水中微量元素的含量。氟素能提高釉质的抗龋力。饮水中含氟量最合适的浓度是1毫克/升,如浓度过高可发生氟中毒(氟斑牙)。作者调查柯伦木、加里宁、唐波夫、莫斯科和索赤等5个城市的12岁小学生的患龋情况,共调查660人,每个城市80～300人。研究结果如下:
Residents suffering from dental caries and caries severity, to a certain extent, depends on the characteristics of the geographical and drinking water trace elements. Fluoride can improve the enamel anti-caries. The most appropriate concentration of fluoride in drinking water is 1 mg / l, such as fluoride poisoning can occur if the concentration is too high (dental fluorosis). The authors investigated the prevalence of caries in 12-year-old pupils in five cities of Corum, Kalinin, Tangpov, Moscow and Sochi. A total of 660 people were surveyed, 80 to 300 in each city. The results are as follows: