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Ear plugs and abrassion

Regarding a number of threads on loud sounds and ear plugs (on both
lists), I believe I recall reading that there is only one layer of skin
inside the ear canal, compared to 7 (?) layers over the rest of the body.

(1) Is this correct?

(2) What are the short and long term abrasion effects of various kinds of
ear plugs?

(3) If there is some wax (or debris) buildup in the ear canal, what
happens when long (or contoured) plugs are inserted?




-11 and not-a-cloud