> Also doesn't water fluoridation cost a few IQ points?
Yes
https://ntp.niehs.nih.gov/whatwestudy/assessments/noncancer/...
Yes
https://ntp.niehs.nih.gov/whatwestudy/assessments/noncancer/...
The combination of flouridated water, tooth paste, and other sources, etc can lead to levels that can cause problems, but it's not as simple as "fluoridated water bad".
So maybe not exactly "water fluoridation cost a few IQ points" in a broad sense, but close enough.
> The PHS panel that provided the recommendation considered all sources of fluoride intake and recommended 0.7 mg/L as the concentration that maximizes fluoride's oral health benefits while minimizing potential harms, such as dental fluorosis.
1.5mg/L was where effects could possibly start to be detected. That's over twice the recommended concentrations.
https://www.cdc.gov/fluoridation/about/community-water-fluor...
From the NIH source above posted by WorkerBee:
> 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.
https://ntp.niehs.nih.gov/whatwestudy/assessments/noncancer/...