At the recent Siggraph 2011, Steve Cooper, Poser Product Manager, demonstrated a new feature in the upcoming release of Poser 9: "sub-surface scattering" which allows light to penetrate and reflect off of surfaces like teeth and skin.
The new Poser 9 (along with Poser 2012) is set to release on Sept 20, 2011. There are some excellent pre-release sales going on. Check the SmithMicro site for details:
http://poser.smithmicro.com/comingsoon/