Need dental work done!

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I need 2 crowns and 5 fillings. I'm almost 6 wks. Ob gave me a release that it was ok to have lidocaine anytime but the dentist said it was ok to wait until the second trimester. Anyone have any experience with getting dental work done during pregnancy. I'm worried about getting the lidocaine. Plus I'd like to get all this work done before I get to big lol.