I had the same question when I was recommended to wear hearing aids. I asked a doctor at the hearing aids staten island clinic. He told me that though it may seem that increasing sound levels by wearing hearing devices can be damaging to your ears (we've all been warned about turning our music up too loud), properly programmed hearing aids will not, themselves, damage your hearing. But it has to be noted, there might be side effects like tinnitus, headaches, soreness around the ears, skin irritations, itchy ear canals, etc. It is individual, I guess.