I have had the 4th and hopefully final phase of the root canal. My jaw now feels somewhat sore, more I suspect from the metal thing the dentist screws round your tooth to keep the filling in, then having the nerve gradually reamed out with very tiny files and then filled with various nasty things<. As it was infected again he has given me some antibiotics on a yellow prescription. They are the vicious ones that taste metallic and that you can't drink alcohol when you're taking them, not that the probability that I will have alcohol in any given few day antibiotic cycle is that high anyway. I have started eating the live yoghurt, in the hope that taking it internally will be sufficient :-) The dentist said he had put a filling on but I might need a crown so clearly the idea of trying to save the previous crown was quietly dropped. The tooth was held together with a giant filling before for years anyway.