Creating this pose I noticed some issues. The most serious one is that when you move the lower jaw from side to side, this movement breaks the mesh in the lower jaw area, especially the teeth. I think it has to do with the weight map of that particular bone in the rig. In addition, when combining certain mouth poses, the lower inner jaw geometry, which seems to be a little tall in my opinion, penetrates the outer lower jaw geometry. It cannot be fixed with the available morphing sliders. Maybe these issues could be fixed with a future update?