In the hilly part of Central India, the Alirajpur and Jhabua districts in Madhya Pradesh are known for the high fluoride levels in their underground water. The government has done a great job of drilling and providing handpumps in most locations. However, many of the handpumped wells have high levels of fluoride in their water. Long-term ingestion of large amounts of fluoride can lead to dental and skeletal fluorosis. Symptoms include staining and pitting of the teeth, joint problems, and abdominal pain and vomiting.
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Source: Phys.org