I am sorry this happened to you in this fashion. If the dentist noticed you were having pain, he should have stopped doing what he was doing. Obviously, the procedure was not correctly done or there was a direct association between the tooth and your ear. My thoughts are that you should see an audiologist and have a hearing test to see where you hearing loss is located; and to describe to her/him what type of tinnitus you are having. Stay on the steroid as prescribed to decrease the inflammatory response. They may have a care plan to help you with the tinnitus and hearing loss going forward.