Hearing aids that can’t be seen are small, custom devices that go inside your ear canal. They cannot be seen from the outside, as they are so deep down inside. There are two styles of these types of hearing aids: Invisible in Canals (IIC) and Totally in Canal (TIC). The IIC styles generally fit farther into the canal than TIC styles, which are still very small but visible to some people if they look for them.
