Why do they not heal back like a bone or soft tissue? We just have one pair and that’s it…
In: Biology
Well typically we have two pairs, we lose our baby teeth and grow in adult teeth in late childhood.
But anyways, natural selection really only cares about surviving long enough in life to reproduce and then raise our next generation so that our genetics can continue. Any life beyond that is just bonus for us personally, as far as evolution is concerned.
Through most of humanity’s existence, we’ve tended to start reproducing by our mid teenage years, and by the time we hit 30, our children would be having kids of their own. So not too long after that, we’d no longer be particularly relevant in regards to evolutionary purposes. Whatever happens to us after that doesn’t matter so much.
Basically even without much in the way of active healing, our teeth would’ve tended to last long enough to get us through our reproductive “purposes”, so there wasn’t any evolutionary pressure to evolve teeth that could heal themselves. Our teeth are good enough as far as natural selection is concerned.
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