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Did you read the rest of the Wikipedia article? How is better to add fluoride in the amounts the US does? It says in the Wikipedia article:
Also, new research highlights that high levels of fluoride is problematic for pregnant women (it affect cognitive abilities of the unborn child).
I found this good review article based on a study commissioned by the Canadian government.
https://www.tandfonline.com/doi/full/10.1080/10408444.2023.2295338
It seems like potential IQ effects are still difficult to distinguish as a dose response, so they weren't able to come up with a point of departure. It doesn't help that in a lot of studies comparing "high" and "low" fluoridation effects on IQ, the "low" is still higher than the WHO recommended level of 1.5 mg/L, and the US recommended level of 0.75.
I think the optimal level is likely going to vary by municipality based on the quality of dental care and the use of fluoridated toothpaste (that everyone overuses), and consumption of high fluoride beverages like tea. I guess my main takeaway is that people need to read their local water quality report, and do what they will with that information