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Research on the intellectual ability of 6-14 year old students in an area with endemic fluoride poisoning

Using Chinese comparative testing, an investigation of the intellectual abilities of students at Hongwu Elementary School (Ankang city, Shaanxi province) was carried out; with the subjects coming from an area that has drinking water-related endemic fluoride poisoning, and the control selected from among students who live in non-endemic areas but who go to the same school. The endemic area is at the outskirts of the city, a single village consisting of 1000+ residents whose water comes from a

Dental fluorosis in Grand Rapids during the seventeenth year of fluoridation

At all ages 7.1 per cent of white children with continuous residence, and 15.9 per cent of Negro children with the same history, showed one of the positive signs of fluorosis--very mild or mild in degree. About the same proportions--7.7 and 14.1 percent, respectively--were found in children aged 12 to 14 years. Community fluorosis indices as defined by Dean, were .14 and .33 for white and Negro children of all ages with continuous residence, and .15 and .31, respectively, for continuous-resident