Hi there, healing a decayed tooth has been accomplished before by Dr. Weston A. Price. I am currently doing an experiment to see if it will work for me. The doctor I work with (not Dr Price, but another Dr.) told me it has worked for him and some other patients. So, what you do it get some high vitamin cod liver oil and some high vitamin raw butter (Dr. Weston sells his own brand called X factor Gold) and you take about 1 teaspoon of each at breakfast and dinner, make sure to take them together. I have used it for about a month and just recently went in for a second opinion for a possible root canal and was told that the tooth is now fine. This could be a coincidence, but just in case, I do have two known cavities that I am "working" on. I will update my progress in a couple months when I go in for another check up. Good Luck.