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.
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.