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I eat a fairly normal American diet and grew up in a place with minimal fluoride in the water, and I have near-perfect teeth I also occasionally simply forget to brush I do chew a lot of gum with xylitol but that's a recent development Imo tooth quality is largely genetic
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I suspect it's levelling out genes, environment, and diet. Genes: good tooth and mouth structure, and good overall health. Environment: altitude, water quality, pollutants. Diet: Sugars, hydration, saliva pH, mouth microbiome, and eating foods which may cause dental trauma.
(to be clear, I am not attempting to imply anything in particular with this datapoint! I don't know what it means. these folks didn't eat candy but they probably ate a decent amount of fresh fruit, which is sugary. they mostly had pretty good teeth iirc? could pull up pics lol)
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