Tinnitus, a perception of sound when no external source is present, is a dangerous condition that can lead to dementia and mental illness like depression. Japanese doctors have focused on the link between tinnitus and hearing loss and have come up with an effective treatment that trains the brain with a hearing aid. We report on the training, as well as a 2 mm-wide cochlear implant being developed for those with severe hearing loss. We also offer tips on how to train the brain to boost hearing.