Recently I've been playing with prosthetics and making myself into an orc.
I started with playdough since flower + water = glue, if you wet playdough a little it will stick to your face.
The playdough recipe is on the cream of tartar tin:
Method: Mix all ingredients together and kneed till a nice consistency
Here's a video and images of my learning journey:
I then found some video's of how to do it with liquid latex and cotton wool on "Monkey See Monkey Do" http://www.monkeysee.com/play/15281-making-zombie-teeth
So I bought some liquid latex and cotton wool and went to work
I was trying to be a little more confident that I actually felt and convince myself that what I was doing was not going to leave me looking hideous and terribly armature.
A few days later I had decided that I wasn't happy with the jaw and so I made a different one that covered my chin. I am quite happy with the result
Then finally I had to take it off, after picking up pizza of course ;-)