it's not just 1 article. it's a series of news articles and
scientific journals. doing a simple search on google will lead you
to tons of them.
the point is that during the 1940s and after, the US needed to
manufacture large amounts of flouride, and at the same time conceal
it's true purpose. A bomb scientists were told to do a study with
experiments to prove that flouride was safe, but the results were
reversed, and that flouride was NOT safe. however that did go no
well with what they wanted, so the results were classified and it
was publicly stated that flouride was safe for consumption.
after the cold war paranoia, many of the A bomb scientists left and
began doing more independant research on flouride and their effects
on humans. a continent doesn't ban flouride in their water over a
little paranoia.