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 <

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

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