1: Total hearing loss, that is, no longer have any hearing.
2: Subjectively have great expectations of hearing aids, thinking that wearing hearing aids will make them exactly the same as normal people. These people are not suitable to wear them, because there is still a gap between hearing aids, no matter how advanced they are, and normal ones.
3: If you have otitis media, you can choose to wear a back-of-the-ear device after three months of healing without recurrence, and an ear canal device is not appropriate. As for patients with severe tinnitus, you can choose hearing aids with tinnitus masking function.
4: People with congenital third-degree malformation of the outer ear are not suitable to wear.