Hello I have read your query and understand your concerns. root canal is not really have a direct effect on the fetus during pregnancy. Although the film(x-ray) is necessary to examine the tooth,but the radiation in question is minimal and x-rays are directed towards the mouth and not the abdomen. Other possible sources of risk associated with root canal treatment are: anesthesia. Dentists often use small amount of anesthesia to pregnant women. But if the dose is not sufficient to alleviate the pain of the patient, the dose may be increased gradually. As the tension of the dental procedure has a detrimental effect on the baby, additional anesthesia is preferable to allow the stress affects the baby. The antibiotics. They are often prescribed to fight infection after dental procedure. However, doctors do not prescribe antibiotics that are not safe for pregnant women. as far as swollen gums are concern that can be related to pregnancy gingivitis. to prevent pregnancy gingivitis it is especially important to practice good oral hygiene habits, which include brushing at least twice a day, flossing once a day, and using an antimicrobial mouth rinse. If you are due for a professional cleaning, don t skip it simply because you are pregnant. Hope this ans helps Regards Dr. Shesh