Dental cleaning and cavity filling are considered very safe in pregnancy and might prevent oral infections that can cause premature labor. But first check with your health care provider to make sure he or she is comfortable with your having dental work done.
Dental x-rays, if you are wearing a lead apron, are considered safe for your baby.
Local anesthesia with Xylocaine (Lidocaine®) is safe. However, many health care providers will prefer that your dentist does not use Epinephrine (a vasoconstricting agent) mixed with the Xylocaine.
Dental work late in the pregnancy may be difficult for you since it often requires long periods of lying on your back.
It is a good idea to postpone major non-emergency dental work (e.g. root canals etc.) until the second trimester or until after your baby is born.