MichaelBaranows:
It surprises me that people use rental or training gear and have no problem with using the same mouth pieces. To me that is like brushing your teeth with someone elses tooth brush.
It surprises me that people make such a fuss about sharing mouthpieces. Do you guys bring your own, autoclaved plates and mugs when you go to a restaurant, too?
Think about it: The rubber material the mouthpieces are made of are inert surfaces, that means as long as they're exposed to water-soluble substances (read: saliva), it doesn't stick and flushes away in plain water even without any use of detergent. Furthermore, I can hardly think of any other piece of equipment that experiences as much rinsing as scuba gear. I bet your reg mouthpice is flushed clean by the time you are climbing on the boat, unless you decide to keep your reg in your mouth until you actually sit down on the bench. Even then the rinse tank will take care of whatever remains. Another thing most of us don't consider is that even if any "remains" from previous users were to be left on the mouthpiece, they don't pose any harm after they dry. HIV, to use an extreme example, survives less than a few minutes outside the human body, apart from the fact that saliva has a neutralizing effect on the virus by itself.
The whole issue is purely psychological and personally I'd feel much worse about renting a reg whose orifice is totally worn down by folks insisting on attaching their own mouthpieces. I'd rather share my reg with others than have the mouthpiece come off at 100 feet and potentially drown.
If you are worried about germs, here are some things to really worry about: Elevator buttons, computer keyboards, shopping cart handles. If you don't believe me, check this out:
http://abcnews.go.com/GMA/story?id=2859060
When it comes to germs, it's all in our heads. (Isn't it amazing how many people live by "3- or 5- or whatever-seconds rules", when any fourth grader when actually thinking about it must realize this has to be complete bogus?)
How many of us would ever drink from a toilet bowl? Nobody? And how many of us would take a call on their office phone and then reach for their sandwich without washing their hands? Anyone?
Guess which is worse for you?
;-))