元谋县平田乡,英户村,改水前有35户,184人,长期饮用浅层高氟井水(水氟含量2.21～2.25毫克/升),氟斑牙患病率为57.57％,1987年改饮山泉低氟水,于1991年进行改水效果对比调查,结果如下: 一、调查内容及方法水氟测定,氟斑牙诊断标准均按改水前相同方法进行,调查重点为改水后5～15岁儿童牙齿受损情况, Yuanmou County Hirata Township, British households, before changing the water 35, 184 people, long-term drinking shallow high-well water (water fluorine content 2.21 ~ 2.25 mg / l), the prevalence of dental fluorosis was 57.57%, 1987 Years to change the low-fluoride spring drinking water, in 1991 to compare the effect of water diversion, the results are as follows: First, the contents and methods of investigation Fluoride determination, dental fluorosis diagnostic criteria are the same as before the water change, the survey focus on water After 5 to 15 years old children with tooth damage,