The teeth are mostly for show. Anything you would use those to cut...the other edge would be through it with one swipe.
The only serrations I have seen that actually were really useful were on the top edge of the hollow handle fighters by Robert Parrish. Those really did work.
My first custom was a Robert Parrish HHF. I had to get rid of that as I was not allowed to take it to Somalia because the serrations on the back violated the Geneva Convention. Due to the nasty wound they would cause.
I tried to bargain with the JAG Captain that if I used the knife I would make sure the individual I stuck it in would not need medical attention. It was at that point that my Company Commander grabbed me by the collar and pulled me out of line.
So upon our return I got on the phone with Walter and bought my first Model 2...$450!