Really important and true science-based information. There are dentists who will no longer pull teeth even if the patient is experiencing severe pain. Instead, they send him/her off to see a root canal specialist. This book gives moral support to those who do not wish to have a root canal. A root canal is a "radical procedure." I was told by a dentist that books such as this one are "fringe science." No, it is the root canal that is fringe science. By way of comparison, suppose a man has a pain in his leg and goes to see a bone specialist. The bone specialist says, "not to worry," we will drill a hole in the bottom of your foot. Then, we will take a round rasp file and remove most of the bone marrow from your leg bone. Then, we will use 5% sodium hypochlorite (regular bleach) to kill off any bone marrow that remains and to disinfect. Then, using a long tube, we will rinse and dry the inside of your leg bone. Then, we will fill up the inside of your leg bone with latex door and window caulking. Then, we will use a big round cork to plug the hole in the bottom of your foot and you'll be happy for the rest of you life (such as it is and whatever's left of it). To a bacterium, a tooth is as good as a leg bone. It is when we are older, with less robust immune systems, that these root canals can produce serious and even fatal diseases. And remember, Isaac Newton's calculus and Albert Einstein's relativity were "fringe science" in the beginning.