Popper mastication motions require uniformly level teeth. I don't see getting them to grow properly interlocking, with the correct position of molars/incisors being a particularly easy task.
I can see them growing the teeth in a external environment then selecting the appropriate ones then implanting them.
yep i can see getting the right shape and definition taking a very very long time.
We can grow lots of tissues but growing them in anything like a usable shape is difficult