Epidemiology
In some areas, skeletal fluorosis is endemic. While fluorosis is most severe and widespread in the two largest countries - India and China - UNICEF estimates that "fluorosis is endemic in at least 25 countries across the globe. The total number of people affected is not known, but a conservative estimate would number in the tens of millions."
The World Health Organization recently estimated that 2.7 million people in China have the crippling form of skeletal fluorosis. In India, 20 states have been identified as endemic areas, with an estimated 60 million people at risk and 6 million people disabled; about 600,000 might develop a neurological disorder as a consequence.
Read more about this topic: Skeletal Fluorosis