I have tried to find posts that showed oil pulling worked to cure root canal infected teeth. I have only found posts that showed it healed teeth that were still alive. Since a root canal is because the tooth root has died. The person has an unatural dead tooth being propped up in his mouth and if you research root canals and Dr. Price, his research on people with root canals -you and your friend may never opt to have a root canal done again. This is my opinion. I will never have a root canal knowing what I know now. There is a forum here on root canals cleanup. They know all about them, and would be happy to help.