Two quotes about fluoride from many decades ago

"Fluorides are general protoplasmic poisons, probably because of their capacity to modify the metabolism of cells by changing the permeability of the cell membrane and by inhibiting certain enzyme systems. The exact mechanism of such actions is obscure." Journal of the American Medical Association, Sept 18, 1943, Editorial.

"The plain fact that fluorine is an insidious poison, harmful, toxic and cumulative in its effects, even when ingested in minimal amounts, will remain unchanged no matter how many times it will be repeated in print that fluoridation of the water supply is 'safe'." Ludwig Gross, M.D., former Chief of Veterans Administration Cancer Research, Bronx, NY.