I don't know much about the codeine because I've never had to take it. But I'd follow up with a doctor.

As for teeth:

I had one wisdom tooth taken out at 28 weeks pregnant, in the chair, with a local. It took 10 minutes, and I caught the bus home. Too easy. AND I got to eat chocolate mousse and jelly for two days.

Also, I have another one that moves up and down a little bit. Last visit, my dentist said that if my oral hygiene isn't spot on, I might feel it move a little bit more, and it will cause me more pain, and I have definitely noticed that it's the case. So make sure you are brushing, flossing and rinsing twice a day, and it may help.