It's interesting that this thread should come up now. Around Thursday of last week I started to feel some pain/sensitivity in some of my teeth (upper right side). I had some dental work done last month and I thought it was related to that, until the pain started spreading to my front teeth and then even my lower teeth. On Saturday I ran my tounge around my mouth and realized I was developing canker sores. It hasn't happened in a while, but depending on where the sore is, it will cause pressure/pain in my teeth.
I usually do get more than one sore at a time, but this time I have six. I have never had this many at once. In addition to the tooth pain, my throat is dry, feels swollen, and it hurts to swallow. This has happened on occasion before depending where and how far back the sore is. And of course, the sores themselves are hurting now. Suffice to say right now I am not a happy camper.
I usually find that the best way to relieve the pain is just by taking pain relievers and waiting it out. As far as the cause, I've given up trying to figure out why I get them. In an earlier post someone suggested they can be caused by lack of sleep. I've never heard that before but I do know that lately of been suffering the worst bout of insomnia of my life.