There have been claims that a large number of people who underwent endodontic treatment developed tumors on that same side of the body. However, according to the American Association of Endodontists, there is no scientific research that backs this claim.
This myth started because of poorly done research in the early 1900s that claimed "dead” tooth structure in the body can lead to cancer or a root canal can prompt bacteria to travel to other areas of the body and infect them, resulting in cancer. However, none of these facts have been proven.
In fact, a root canal procedure is done to eliminate the infection in your tooth. If left untreated, this infection can spread to other areas of your body and cause sepsis and other serious health issues.