在自来水中加入氟化物1ppm已17年的区域,作者选择8—13岁的学龄儿童约900名,分为对照组及实验组,后者以含氟化锡的漱口剂(含250ppm氟化物即0.1%氟化锡),每月在教室内老师指导下,连续进行三次漱口,各次时间为10秒,共进行两学年实验.对照组同样进行漱口,但漱口剂内不含氟化物. In tap water, where 1 ppm of fluoride has been added for 17 years, the authors selected about 900 school-aged children aged 8-13 years and divided them into control and experimental groups, which received tin fluoride containing mouthwash (containing 250 ppm of fluoride That is, 0.1% tin fluoride). Under the guidance of the teacher in the classroom every month, gargle three times in a row for 10 seconds for a total of two years. The control group also performed mouthwash, but the mouthwash contained no Fluoride.