heyas; um... build the teeth and gums (and tongue), and insert them into the head. make sure the head mesh has a mouth cavity, of course. nothing really needs to be connected, just jam the gums up into the mouth cavity. give the gums/teeth new materials, but make their group the head, and you'll be fine. :) in fact, it would be better if your model were constructed that way, rather than one continuous mesh. it'll be easier for morphers to separate the various parts to work on.