A simple photoshop trick:
 ( I realize this may be very elementary for some, but others might not know)

If you know how to use quick mask - select the teeth with that.  If not just use the lasso.

Go to Image>Adjustments> hue and saturation 

Adjust hue upwards - anywhere between +1-12 works for me.

then Image>adjustments>brightness and contrast.  Decrease brightness a bit.

I've used this mainly in photographs.  I dont show teeth much in poser because I hate thier perfection.

I am:  aka Velocity3d