Comment by cosmotic
22 days ago
I didnt look too closely, but the concentration recommended by the FDA is much lower than many of the sample sets in that linked study. Some 10 times as much. One is a hundred times as much.
Not sure if that first link was to the Harvard summary intentionally but heres the actual study: https://ehp.niehs.nih.gov/doi/10.1289/ehp.1104912
The second link showed a concentration as little 2x the US amount was impactful.
*The NTP monograph concluded, with moderate confidence, that higher levels of fluoride exposure, such as drinking water containing more than 1.5 milligrams of fluoride per liter, are associated with lower IQ in children. The NTP review was designed to evaluate total fluoride exposure from all sources and was not designed to evaluate the health effects of fluoridated drinking water alone. It is important to note that there were insufficient data to determine if the low fluoride level of 0.7 mg/L currently recommended for U.S. community water supplies has a negative effect on children’s IQ.*