Eli5: Why do we not regrow teeth and limbs?
In: Biology
Limbs: at some point it became evolutionarily better to quickly heal with scare tissue than take longer to start growing a new limb properly, so that’s what happens.
Teeth: mammals evolved to have teeth that are specially shaped and fit together nicely, allowing for more efficient chewing. Reptiles have a load of the same kind of teeth that continually grow and replace. For mammals’ nicely arranged teeth they can’t keep losing and regrowing teeth because it would mess the arrangement up, so we just have one final set we keep.
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