Regrowing teeth instead of fillings:

http://www.zmescience.com/medicine/regenerate-teeth-no-fillings/

A great development!

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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.

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

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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.