None of the studies I have seen properly account for the lifetime effect, and instead only deduce lack of harm from flawed isolated studies.

It’s in the entire water supply.

You were gestated in a womb of a woman consuming highly fluoridated water.

You were fed formula made with fluoridated water tuned to dose a 200lb man when you were 8lbs.

The water you drank as your bones were growing was similarly overdosed

The food you eat is washed in fluoridated water. The coffee and beer you drink is brewed with fluoridated water. The bread you eat is made with fluoridated water.

Basically, the dose is insanely wrong from the get go and then it’s applied to everything so there’s no way to accurately measure exposure. Then factor in the bell distribution and you are massively overexposing huge numbers of people a few standard deviations out.