Comment by dcow

I think you should read it. It literally says fluoride in higher concentrations is linked to lower IQ. It says there is insufficient evidence to draw any conclusions in lower concentrations. NOT that fluoride in lower concentrations is definitely without a doubt safe. It leaves open the question. And, it studied fluoride in urine, which means even if the drinking water levels in the US are in the “insufficient data” range, the cumulative effect of multiple sources of fluoride is still a factor.

Also note that in reality 0.7 mg/L is the “low” value and 1.5 mg/L is the high water mark from the study. That’s not a huge window by any means…