Dear friend. Its not correct. root canal treatment is an specialized treatment where dead nerve tissue is removed from an dead non vital tissue to save the tooth structure to maintain chewing of food and also prevent extraction. For any cancer to originate there should be malignant cells( cancer cells). Now big question is how will bacteria produce cancer cells? Bacteria are capable of only multiplying their number, produce toxins and cause dental infections and not cancer. properly done rct with completely removed dead nerve tissue is considered to be almost sterile and bacteria. AS PER THE ARTICLE, IF BACTERIA FROM RCT TREATED TOOTH CAN CAUSE CANCER. THEN CRORES OF PATIENTS WHO HAVE UNDERWENT RCT MUST DEVELOP CANCER WORLD WIDE. MY SUGGESTION IS NEVER GET AFFECTED BY THE ARTICLE. RCT IS AN ABSOLUTE SAFE PROCEDURE. BYE.