Fluoridation for public health is done at lower levels than fluoride is found naturally in water in other areas.
If it's harmful as you imply, lots of water would need defluoridation.
If it's harmful as you imply, lots of water would need defluoridation.
Sounds like it's not important to address fluorine reduction if a casual relationship can be established.
I do wonder how they compensated properly for fluoride being added in poorer areas. Will dig it out when I get chance.