Use the drop-down menus to complete each sentence. Ear drops are a liquid medication placed into the to treat external ear infections, typically containing antibiotics and anti-inflammatory drugs. Ear irrigation is washing of the external auditory canal using a stream of warm water in order to remove a or foreign body. Tinnitus masking is a treatment for tinnitus that involves the use of . A hearing aid is a small electronic device placed into the external auditory canal in order to improve .