z quiet doesn't work, it's very difficult to keep these pieces in your mouth at night, I found myself gagging and resisting the gagging reflex.
also if you're not slobbering your mouth is very dry. I think that is not very natural to have a mouthpiece of the size and stiff in your mouth and try to go to sleep. Also I kept it for about a month or so to give it my best try then tried to return it and I could not. I would not recommend it as the snoring solution