I had a failed root canal and abscess shortly after getting rsd. I also broke three teeth months after rsd just by eating things like cereal. I had a tooth pulled from the failed root canal and just before that was done, the gums in my mouth were so swollen and sore I could only eat soft things like pudding and liquids for about a week. And I just had a crown put on a tooth, and need extra novacaine and painkillers when I get things like this done now because I'm more sensitive to pain from the rsd. I don't know if the gum swelling,pain and broken teeth were related to rsd, but being that it happened right after, I think it was. My doctors aren't sure. They all tell me something different. Some say it does spread and others say it they are not sure.