Why do I have aching pain in jaw month after crown and endodontist says I don't need root canal?

I cracked my tooth and had a dull, aching type of pain on the inside of my jaw, below the tooth, that extended from my jaw to my ear from the time I had my temporary crown put on. I had my permanent crown put on about a month ago and the pain is still there. I went to an endodontist and he x-rayed and probed the tooth and, because there is no pain or sensitivity in the tooth itself, won't do a root canal. I am taking ibuprofen for the pain but have had it for weeks. Now what?