Only about 5% of the world population is fluoridated and more than 50% of these people live in North America. The Danish Minister of Environment recommended against fluoridation in 1977 because "no adequate studies had been carried out on its long-term effects on human organ systems other than teeth and because not enough studies had been done on the effects of fluoride discharges on freshwater ecosystems."

"In 1978, the West German Association of Gas & Water Experts rejected fluoridation for legal reasons and because 'the so-called optimal fluoride concentration of 1 mg per L is close to the dose at which long-term damage [to the human body] is to be expected.' "

Quotes from: Hilleman B, "FLUORIDATION: Contention won't go away," Chemical and Engineering News, 1988 Aug, 66:31 (The [ ] brackets were in the original article)