Before revision: Tinnitus retraining therapy (TRT) is a form of habituation therapy designed to help people who experience tinnitus , a ringing, buzzing, hissing, or other sound in the ears when no external sound is present.
After revision: Tinnitus retraining therapy (TRT) is a form of habituation therapy designed to help people who experience tinnitus — a ringing, buzzing, hissing, or other sound heardsource when no external sound is present.