Hi Mark. I have a question I hope you can help me with. I had a root canal on one of my upper molars almost three years ago and I had a metal crown fitted. Now, I keep getting a severe cold, fever or a bad neck. I also get severe pain in that particular tooth for around one week and then the pain goes away by itself. I have been to the dentist for normal check-ups, they have X-rayed it, but they can not see anything wrong. Is there any reason for the pain in that particular tooth and do you know of any solution or remedy? Please help me! Thank you.