Fluoride: The dumbing-down of a generation:The Chinese evidence at a glance

In the Chinese study of 907 children from four areas in Guizhou Province, the degree of exposure to fluoride was clearly linked to IQ test scores:

Type of area Fluoride concentration Number of children Mean IQ

Non-fluorosis < 0.4 ppm 220 99.4 ± 10.4

Slight fluorosis 0.8 ppm 227 89.7 ± 2.7

Medium fluorosis 2.5 ppm 224 79.7 ± 12.7

Severe fluorosis 3.2 ppm 230 80.3 ± 12.9