I am in favor of having the visable mouth guards like Marshal faulk wore, that Frank Gore currently wears and others.. but i hate reading posts like the one I quited becasue despite the intention, too many times people wrtie things like acting as if not seeing a visable mouthguard means no one "wears" them in madden. Every player in football has to whear a mouth guard, but very few wear one that has an exterior showing and/or is atached to the facemask so they can spit it out and put it back in again.
In real life you see players on the sideline take thier mouthpiece out and place it in their helmets, or like I said some have it attached to the front of their facemask so that post play they can spit it out and put it back in after the huddle breaks.