A couple of weeks ago I was working on a female model and I finally reached the point of posing the smile. Unfortunately, the front teeth top and bottom were... well.. I think she spent her (the model) childhood as a bum because the front teeth were in serious need of attention. I've looked at a fair number of people now and most of them have the bottoms or tops of their front teeth flat depending on how you look at it. (top front 4 and bottom front 4). The second problem I had was the teeth were too large. I fixed the meshes in Blender.
What I would suggest is to correct the front teeth geometry and add 2 vertex groups in blender. One group for just the teeth and the other for the gums and teeth. The gums and teeth group would allow me to quickly scale it to the right size and the teeth group would allow me to assign a material easily to the teeth alone. They should look like they are wet.
My goal in finishing a model is to have it look 100% real. I'm getting close, but I'm not there yet. I worked with the MH program for a while now and I'm impressed with the huge progress you continue make in this project. I've tweaked your textures and UV maps to put the skin in the right places on the knees and hands. Skin pores and realistic hair are still challenging. Do you find the aqsis renderer to be better than yafaray? I've never used aqsis.