I don't like  the inner mouth to be a seperate Bodypart , because when doing my own (open mouth) face morphs I had to hack the cr2 to make the teeth follow . I am simply not skilled enough for that.It is a main reason for me, why I don't like V4 .In case head and inner mouth will remain in one bodypart you can also select each material zone ore group seperatly in your modelling app - even inside Poser - ,to exclude teeth when creating a face morph .