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Does anybody know how long the mouthpiece lasts? I read that it should be replaced every half a year or so. Is this true? If so, how much should replacing it cost?

Hi all, I am 34 years old and my tinnitus started about a year ago. Some background (actual tinnitus section below that): A few days before it began I was extremely stressed and on one of the nights it was really hard for me to fall asleep. When I finally fell asleep, I woke up soon after...