Why is Fluoride added to city tap water?

Why is Fluoride added to city tap water?

2010 Fluoride, or Hydrofluorosilic acid (H 2 SiF 6 ), is not naturally occurring but is a waste by-product derived from the industrial manufacture of aluminium, zinc, uranium, aerosols, insecticides, fertilizers, plastics, lubricants and pharmaceuticals. Read...
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