I don't know the answer, but my dentist does not like to do any dental work on anyone during any stage of pregnancy. I have 2 tiny sticky spots...I guess they are pre-cavities that were discovered a month before I became pregnant. My dentist said I should wait until after delivery to get them fixed. But I have also read in a pregnancy book that since you are more prone to plaque and dental caries during pregnancy that you should have your teeth cleaned and checked at least once during pregnancy. However, my dentist doesn't agree. And I don't really care because I only go to the dentist once every 2-3 or 4 years. ($$$$) Sorry I'm not more help, just thought I'd pass on info about how my dentist feels.