Even with no evidence of trauma or dental issues, these things can happen and some of them serious. The jaw is close to your brain, and infections can travel easily to the brain. I would seek your dentist first ASAP to rule out infection. He will make a recommendation to you if it does not involve dental issues. The dentist is qualified to evaluate your whole mouth. Pain is not a good indicator, so go check it out please. I hope you are able to get help and resolution for this problem. I will be thinking of you. ginnie