The short answer is that they're only showing meshes that are deforming. Teeth are rigid and would be put back in based off the jaw and skull position. If memor

The short answer is that they're only showing meshes that are deforming. Teeth are rigid and would be put back in based off the jaw and skull position. If memory serves, eyeball position tracking isn't great with this approach, it's not all that hard to add back in, and they often want to cheat eyelines anyway.