I had debilitating pain from an exposed nerve. I tried everything but could not get any lasting results. I also did not want to get root canal therapy done, but there wasn't another alternative for me, unless i want to take the tooth out. And tell me, how do you take the tooth out when you are in excruciating pain? The dentist put arsen on my nurve and that killed it. I took out the arsen the SAME Day myself and have never had any pain since. the tooth is still open and I don't really know what do with it at this point. i have another living nurve in that same tooth.