While I agree that sodium fluoride is harmful, the article you linked did not distinguish between sodium fluoride and calcium fluoride. Having a statement like "Fluoride is known to have both beneficial and adverse effects on humans." without distinguishing between the two is adverse.
While I agree that sodium fluoride is harmful, the article you linked did not distinguish between sodium fluoride and calcium fluoride. Having a statement like "Fluoride is known to have both beneficial and adverse effects on humans." without distinguishing between the two is adverse.
As far as I know, ions in solution dissociate. Your distinction between sodium fluoride and calcium fluoride in drinking water makes no sense to me.
As far as I know, ions in solution dissociate. Your distinction between sodium fluoride and calcium fluoride in drinking water makes no sense to me.
And you can read about the effects of fluoride on intelligence here.