From my mum's experience (With progressive hearing loss over about 15 years and eventually, two cochlear implants) firstly putting them on to begin with and then any time they are re mapped, the first couple of weeks seemed to be a terrible experience for her with everything being very loud and intrusive.
Time and patience and him having the will to get the best out of them I think are the key. Unfortunately after a decade in the RAAF, working in a noisy environment I will be lucky to get to 55 before I will undeniably need them. I know my hearing is quite ordinary for my age but it is tolerable at the moment, but barring some medical breakthrough, it won't be getting better without some mechanical assistance.
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