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....people didn't just... stop researching fluoride after the 40s/50s. Newer studies have found less of a dramatic benefit, likely because brushing with fluoridated toothpaste is more common, but there is still a significant benefit. The countries that reduced water fluoridation and saw little to no change have universal free dental care for children.
A lot of the pushback relies on pointing out that there are diminishing returns. Multiple sources of fluoride don't seem to have compounding benefits. But that completely ignores that the goal is to raise the baseline.
Not all kids are good at brushing their teeth, not all parents care or know to put it as a priority if they're struggling. It's not going to impact virtually anyone above the poverty line, but for the people who need it most it absolutely helps.
Fluoridating water is ridiculously cheap way to add a layer of safety. A ~15-25% reduction in cavities is absolutely worth pursuing.