Over-the-counter hearing aids (OTCs) are not a custom fit—meaning they are not personalized for the shape of your ear canal. Unlike with traditional hearing aids, you won’t have the benefit of a hearing care professional to look at the fit in your ear canal and suggest modifications if needed. If you can’t wear your OTCs all day comfortably, if you have to constantly adjust the OTC in your ear, or if the OTC falls out of your ear easily, see a hearing care professional.