I was thinking on using prop-teeth on Posette   like the ones that mayadolls and other character uses. The problem are the lower teeth that I'm not able to make movable with the mouth without moving the teeth separately   . the simplest way I found is to parent only the upper teeth to the head (they never move) and use the default lower teeth (they are shown only rarely, expecially if the character has big lips). I used the Grouping tool, select the teeth by their material, deselected the lower teeth and I gave a new material to the upper teeth, so that I could make them invisible. I imported the upper teeth prop and parented to the head and this is the result