<s>[INST] Severe pain following root canals, has happened to 4 teeth. No infections present, nothing shows on xrays. Has been several years on lyrica and cymbalta with no explanation or improvement. After root canal I got pain from procedure for a week, no pain 5 days, then rapidly escalated to 7 to nine level. Had 2 root canals years ago , no problem. Only difference is I now have chronic Lyme and Chronic fatigue/fibromyalgia. Seen doctors, dentists... any ideas? [/INST] Hi,Thanks for posting the query,There could be a chance of re-infection accidently any left over canal in the tooth, i would suggest you to get a checkup done take an x-ray of the region. If there is presence of any high points get it removed.A course of antibiotics and analgesics can be helpful.Take a second opinion.Take care! </s>