Essentially you are just pressurising your middle ears, which can give temporarily improved hearing as the middle ear in over inflated and the ear drum extra tight and more sensitive to sound vibrations. This over inflation clears as soon as you swallow or chew and Eustachian tube re-equalises to keep the pressure in the middle ear the same as in the ear canal. The problem with doing this is you might actuallyforce bacteria into your middle ears at times (when you have a cold etc.), which raises the risk of middle ear infection. You could also possibly make the Eustachina tubes flacid by forcing air through them them all the time, causing problems later on,although I unsure how likely this would be to happen.
Originally Posted by ikoiko
Audiologist in Private practice on the Gold Coast, Australia with a clinics in Perth, Brisbane, Sydney and Chatswood as well.