If this research was published by anyone else I am sure it would be dismissed as a “conspiracy theory”. I say that because I have read similar studies published by less esteemed researchers over 20 years ago and they were all labeled as conspiracy theories.
The National Toxicology Program (NTP), resides within the National Institute of Environmental Health Science, which in turn resides within the National Institutes of Health. The NTP just concluded an 8 year study and released a report confirming that Fluoride exposure can cause neurodevelopment and cognition problems - potentially lowering a child’s IQ by up to 5 points.
https://ntp.niehs.nih.gov/whatwestudy/assessments/noncancer/completed/fluoride?
The U.S. has been putting fluoride in our drinking water since 1945.