Earlier quoted context omitted.
I'm not following closely, but is this pseudoscience? https://hsph.harvard.edu/news/fluoride-childrens-health-gran... https://ntp.niehs.nih.gov/whatwestudy/assessments/noncancer/...
Those are based on countries with much higher levels of fluoride than the USA adds. Follow up studies have found the levels in the USA to be perfectly safe and in fact beneficial since poor people don't get dental care like they do in other countries.
HN Comments were very credulous before the election. Shows how flexible belief in science is.