... in early Dec. 2014. For 3 months the sensitivity in the this same tooth became worse. I kept going to my dentist and even found a new one. My new dentist referred me to a Endo. who treated the tooth with the crown with a root canal. My sensitivity is now worse and I have a throbbing pain from that tooth into my whole bottom left side of my mouth. When I drink cold liquid I can swish it around the tooth and hear a very quiet pop sound. The sensitivity subsides, but the throbbing pain continues to get worse throughout the day and the more I drink. My dentist and Endo think I am crazy, because everything is showing up normal in xrays. Please help!