An update on the mouth. I was checking the internet on how to produce a wet like surface and came across this (http://www.neilblevins.com/cg_education/wet_materials/wet_materials.htm) website, which comes up with a way to fake the wetness. Using this technique, I added the coating layer for the teeth, gums and tongue using the shellac material.
The gums still need to be sculpted and properly textured, but the material itself looks pretty nice to me. I also added a gunk layer between the teeth and the gums. It needs a little tweeking, but it does help soften the intersection.