RE: teeth extraction(s)
I had wisdom teeth out when I was in HS. It wasn't fun, but looking back I would put it at worse than a root canal, but not as bad as laproscopy. Childbirth tends to put things in perspective, LOL. Put ice on as much as possible after and ask specifically what you can do to prevent "dry sockets" - had those and they sucked. Here are some links on medications while BF:
http://www.kellymom.com/health/illness/dentalwork.html
http://www.kellymom.com/health/illness/mom-surgery.html
Most of those will probably be fine by the time you are home.
Mama to three boys ('03, '05, '07)