I had teh same worries. I asked my doc and she said it was fine. I just had a checkup and my teeth cleaned, although they say to avoid xrays.
I have to go back soon to have fillings done....6 to be exact and doc said that was fine as long as they only use the white fillings not the silver. The doc says they can give me the anaesthatic but the dentist says i'll be fine without it as they are only small holes.
However saying all this i would wait until your 2nd Trimester before you go, thats what i did, just to be safe.
Good luck