I had all four taken out at once. They put an IV in me and knocked me out for an hour to do it. It didn't really hurt, afterwards, though. They ended up stitching my gums with catgut to the insides of my cheeks and I couldn't open my mouth very far for a couple weeks.
I didn't bruise, but I ended up with a bone chip in my gum that bothered me for a long time. Then it just disappeared.
