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调查表明，四川、甘肃部分地区的藏族、蒙古族、哈萨克族、裕固族居住地水源氟浓度在０．００６～０．０１７８ｍｍｏｌ／Ｌ之间，且无其他氟污染，但４个民族居民均长期、大量饮用砖茶熬制的奶茶，奶茶含氟量在０．１３８～０．１９６ｍｍｏｌ／Ｌ之间。４个民族８～１５岁少年儿童氟斑牙患病率及氟斑牙指数分别为：藏族５１．２０％、指数１．３３；蒙古族５１．７５％、指数２．００；哈萨克族８４．４２％、指数３．０５；裕固族７５．７５％、指数２．５７。他们每人每日总摄氟量是国际公认最高限量的１．４２～２．５２倍。相关分析表明，造成４个民族儿童氟病流行的重要因素是奶茶（ｎ＝１５，ｒ＝０．９９）。
The survey shows that fluoride concentrations in the water sources of Tibetan, Mongolian, Kazak and Yugu people in some areas of Sichuan and Gansu are between 0.006 and 0.0178 mmol / L, and there is no other fluorine pollution. However, all of the four ethnic groups have long-term , A large number of brewed brewed brick tea, milk tea fluoride content between 0.138 ~ 0.196mmol / L. The prevalence rates of dental fluorosis and dental fluorosis in four ethnic groups of 8-15-year-old children were as follows: 51.20% for Tibetan, 1.33 for index, 51.75% for Mongolian, 2.00 for index and 84 for Kazakh. 42%, index 3.05; Yugur 75.75%, index 2.57. Their per capita total daily fluoride intake is 1.42 ~ 2.52 times the internationally accepted maximum. Correlation analysis showed that the main factor contributing to the prevalence of fluorosis in 4 ethnic children was milk tea (n = 15, r = 0.99).