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90% Reduction: Scientists Discover Natural Molecule That Eradicates Plaques and Cavities
(scitechdaily.com)
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It’s 2023, how they ain’t got pills make your teeth grow back ??
I read an article about that. IIRC it's mainly because there is only minimal bloodflow in your teeth - barely enough to supply it with nutrients (and still not enough you should skip external flouride etc.).