Question about hearing aid

Zhang y-zhang at
Mon Aug 12 05:04:21 EST 1996

I have some questions. Can anyone help me?

If one has hard hearing, he will get a hearing aid. The first
question is whether  the hearing aid can impair the hearing ability further,
or it is possible that one has to use a starker aid late. 

If the aid can impair the hearing ability, are there any methods to prevent it?

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