It's not safe to have any work done until your in your second trimester. As for laughing gas, I don't know.
Wow that's a lot. Have you checked with ur ob? I was told i could not have any tooth removed at all eventhough my tooth hurts. I just had cleaning.
I broke a back tooth during my first pregnancy, my dentist put on a temporary cap until after I had my baby because novicain and gas age not safe during pregnancy
I just had 3 teeth removed last week.
Ask your Dr or midwife to write up a note for the dentist it should include everything of what can and cannot be used. I have been aloud to do it since 21 weeks when I had first asked. I actually got them removed at 33 weeks pregnant. 1 was abscessed and other 2 were just cavitys. But got them all pulled same day. No complications. My midwife typed up in the letter I could use hydrocodone lowest mg for pain but I didn't because the pain was bearable. Try to void any narcotics they give you even if they say its safe for baby. You never now. Tylenol works just as good trust me. Go that route. And if they do allow you to remove them don't get all 5 done same day space them out. Just my advice to you.
Don't go by what you read online, go straight to your midwife or Dr. They are the pros and know what's best for you and baby.