Not only regrowing whole teeth, it should be possible to reengage the cells that build the teeth in the first place to repair cavities. All the "machinery" is

Not only regrowing whole teeth, it should be possible to reengage the cells that build the teeth in the first place to repair cavities. All the "machinery" is there, it's a matter of figuring out how to reactivate it. As for crooked teeth, it seems to me that Levin et. al. are unlocking the patterns that govern such things, and we can hopefully look forward to even jaws and even correcting deformed bone structures. It's interesting to try to think about what form a machine would take for "re-imprinting" new skeletal structures into existing bones, eh?