ooooh here comes a somewhat gross story, so consider yourself forewarned.
When I was born I came with a broken jaw. As a child it gave me a really cute crooked smile with my lower jaw going one my and my upper jaw going the other way. Anyways, when you have a problem like that you are not supposed to get it fixed until you have stopped growing. So in 10th grade they gave me braces to get my teeth xtraight before jaw surgery.
My jaw surgery was around March and I was getting my wisdom teeth out at the same time. They weren't sure if they were going to have to operate on only the upper jaw or would have to do both. So intially they only medicated me for about 4 hours. They found that they would have to mess with both so I was over medicated and woke up a LONG time later.
So I had my jaw wired shut for 8 weeks. Wisdom teeth out and cheekbones had to be fixed at the same time. So my jaw was 10 times its normal size and had no feeling in my face. Stiches under my eyes.
The surgery was a great sucess, however one of the downsides is that you can loose feeling permanently in your face. Sometimes it is the whole face...sometimes it is just parts.
I have no feeling at all in the lower half of my face. Took a long time for me to get use to it and if you ever meet me and we go out to eat, that is why I am forever wiping my face with a napkin as I can not feel if I spill food or things of that nature.