Comment by derbOac

https://www.sciencedirect.com/science/article/pii/S003335062...

The best research I've seen on this, from NZ, suggests the neurocognitive effect in typical fluoridation programs is about as close to zero as you can get.

I admit I think people were stigmatized for raising concerns about it before, and find it sort of weird it was added without more safety data, but by the same token I think the most rigorous evidence suggests its pretty safe at the typical concentrations of most fluoridation programs.