It is a bother to export the head and isolate the teeth, but that's one of the first things I do with a model. Then I can make morphs to move them separately in various directions (that's how Judy Magic grinds her teeth in the animated GIF above). Of course, you can also set a figure's teeth material to transparent, then add and fit DAZ's Millennium teeth. I got them when they were on intro sale, but never got around to trying them. They're built into V3 and I assume Michael 2 too.