by 
The Curious Bag
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<h4 class="dechead">On One Hand: They Are Safe
It is safe for women to have root canals while they are pregnant. Modern x-rays that use a leaded apron and thyroid collar should not place the fetus at risk, according to the American Pregnancy Association and the American Dental Association. In addition, the U.S. Food and Drug Administration approved numbing medications for use during pregnancy.
On the Other: If Possible, Better to Wait
It is better, however, to wait until after the first trimester. Obstetricians prefer that women wait until after delivery before undergoing any procedures that have a possibility of harming the fetus, no matter how minimal.
Bottom Line
The decision on whether to undergo root canal during your pregnancy should be made after consulting with your dentist and your obstetrician. If your dentist recommends you have it done while you are pregnant, it is usually because it is more dangerous to postpone because of pain and infection, which could cause damage to the fetus.
Source:
American Pregnancy Association: Dental Work during Pregnancy
American Dental Association: Pregnant? Tips For Keeping Your Smile Healthy
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