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作者于1980年曾调查苏格兰东南部Stranraer镇(该镇在饮用水中加氟已十年,为观察组)和Annan镇(该镇饮用水中从未加过氟,为对照组)十岁儿童龋齿发病情况,结果对照组龋均(DMFT)比观察组高50％,但Stranrear镇的饮用水加氟于1983年停止,作者于1986年再次作
The author investigated Stranraer in southeastern Scotland in 1980 (the town added fluoride to drinking water for ten years as an observer group) and Annan (a town that had never had fluoride in its drinking water as a control group), a ten-year-old child The incidence of dental caries, the results of the control group caries were (DMFT) 50% higher than the observation group, but Stranrear town drinking water and fluoride stopped in 1983, the author again in 1986