Wrong. Robert Kulacz, DDS and Thomas E. Levy, MD, JD, say that a root canal is actually a scientifically flawed and potentially dangerous procedure. "Instead of solving a problem, root canals introduce a steady stream of dangerous-and even deadly-toxins into your body," says Dr. Levy, co-author along with Dr. Kulacz of The Toxic Tooth: How a root canal could be making you sick. "Root canal-treated teeth are not sterile and contain pathogenic bacteria, which spread throughout the body and can initiate or worsen heart disease, lung disease, diabetes, osteoporosis, and even cancer."