These concerns are not limited to fluoride in municipal water, but also excessive fluoride consumption via tea, see. e.g.: https://journals.sagepub.com/doi/full/10.1177/14034948219902...

One wonders, therefore, whether the Victorian British (who consumed an annual average of 6 pounds of tea per person in 1900) suffered from hyperfluoridation, and what its downstream effects might have been... In fairness, and what needs to be noted, the intellectual output of that place and era was highly superior.