TRUTH: Pregnant women can and do undergo root canal treatment. Having a root canal does require a small x-ray, but the radiation exposure is very minimal and the x-ray is aimed at the mouth, not the abdomen area. If you are pregnant and your dentist needs to give you an x-ray, he will use a lead apron for protection. The anesthetics that dentists use are also safe for pregnant women.
Be sure to let your dentist know beforehand if you are pregnant.