Thank you! Very interesting! My anecdotal experience is that my parents were extremely anti fluoride. We never had it in toothpaste, I grew up on well water, and I rarely even saw a dentist growing up. I’ve never had a cavity in my life and my teeth grew in perfectly straight with no braces. Obviously, I’m sure there is a genetic component to that, but if fluoride is at all essential for tooth health it must be in very tiny amounts.
It makes no sense that a trace-element that has no physiological role and is not essential in the strict sense would be needed for something minor as teeth. It's similar to how vitamin A has no actual obvious or proven roles beyond the eyes.
In both cases, the effect seems to be rather drug-like, and not consistent or essential.
It's absurd that this substance actually has a RDA, just because of it's effect on teeth. It is as ridiculous as the RDA for calcium, even though there are no human studies that show a requirement. All just politics.