New studies from China show that an excessive intake of fluoride can accumulate in the brain, permanently reducing a child’s intelligence.
Silicofluorides (SilicoFs) added to drinking water may even promote cocaine use and violent crime. SilicoFs are waste products from phosphate fertiliser and glass manufacturing.
Nearly all toothpastes sold in the US and UK contain fluoride - typically 1000-1500 parts per million. Commonly used mouth rinses contain 230-900 ppm.
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: