Gene could allow lab-grown teeth  

All ordered objects whether organic-living or robot-living will more or less maintain their being by means
of a regular flow of available energy from their outsides to their insides.  Humans eat food and breath
oxygen to burn that food.  They increase the efficiency of their system by pre-digesting their food by
grinding it and cooking it.  Thus the popular hamburger on white refined bread is an example of the
direction in which humans are going.  

The problem for people is that they would be better off if they were battery powered and they could
simply plug themselves in at night.  Looks like the battery powered robot will have the advantage over
the human in the long run.  Battery powered robots with solar cells were the first forms of life to inhabit
the planet Mars, for example.