>It would be cool if we could inject some artificial 3D printing thingies in the gum that feed on nutrients from your body and slowly create a new tooth as programmed beforehand.

Hmm, that sounds just like a cell. In fact it would probably be easiest to find a way to turn tooth regeneration on. Other animals have it, there's no reason why we shouldn't be able to except that we haven't figured out how yet.

I agree though and I've thought that before-- something about the dentists office is especially crude. But then again what do you expect when we have chunks of mineral in our face we use to mash food with? Teeth themselves are rather crude