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> If this were effective, our bodies would probably be doing it already.

Naaah, this is not how evolution works. Tooth decay was not as big of a problem for our ancestors than it is for us (more sugar and acidic soft drinks) and tooth decay becomes more of a problem for older people that already reproduced making good teeth above a certain age uninteresting from an evolutionary standpoint. (And mayebe instead of better teeth we learnded to feed grandparents soft porridge to keep them around longer for babysitting duties ;-) (see the usefulness of aunts in elephants). Just because you like to keep your teeth, doesn‘t mean that nature cares.



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