In some areas,<unk>  is endemic. While fluorosis is most severe and widespread in the world's two most populous 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." 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.
Skeletal fluorosis
Dental fluorosis
Vitamin D toxicity
Hyperparathyroidism
Zinc toxicity
Oncogenic osteomalacia
Calcinosis
Hypophosphatasia