Root canal treatments save teeth that are decayed, infected or seriously injured, explains the American Dental Association (ADA). If you have a deep cavity or a cracked tooth, your dentist may recommend this procedure. While root canals aren't painful, you may be feeling a bit uneasy about the procedure. Perhaps you've read frightening claims that root canals cause cancer and other serious health issues. Is any of this true? Do root canals cause health problems? Here's everything you need to know to feel confident going into your treatment appointment.