If you're American and never had a cavity, be sure to thank the government for they are doing you a solid by keeping the drinking water fluoridated.
The CDC says 75% of Americans have access to fluoridated water and they have set a goal to raise that to 80%.
You may notice the lack of American studies on the effect of fluoridated water on IQ, most of them are Chinese. One could argue this is Chinese propaganda to stir distrust in the American government. This is an interesting point of view that I won't completely dismiss.
Indian
ncbi.nlm.nih.gov
>Differences in participant's sociodemographic characteristics, urinary iodine, urinary lead, and urinary arsenic levels were statistically not significant (P>0.05). However, a statistically significant difference was observed in the urinary fluoride levels (P 0.000). Reduction in intelligence was observed with an increased water fluoride level (P 0.000). The urinary fluoride level was a significant predictor for intelligence (P 0.000).
>The urinary fluoride level was a significant predictor for intelligence
Pee in this cup so I can asses your intelligence
Harvard - American
ncbi.nlm.nih.gov
This one is kind of an aggregation of the Chinese studies.