Regrowing teeth instead of fillings:

The post that was quoted here has been removed

Rodentia do but it doesn't help humans much till this development. Maybe in another 30 years fillings will be a thing of the past world wide. Clean out a cavity, instill in it the tooth stem cells and wait for a few weeks while the tooth rebuilds itself.

The post that was quoted here has been removed

Yes, I see that now🙂 Nice read about them on wiki. Thanks for pointing that out.

The post that was quoted here has been removed

That would be an interesting field to study. But the deep past doesn't have much DNA to match, unless we found an early version of a rabbit inside amber which is unlikely since they could get out of such a trap easily.