Snoring mouthpieces, like the Original ZQuiet Mouthpiece, widen the airway by gently advancing your lower jaw. Widening the airspace in the back of the throat reduces the vibration of the surrounding soft tissue. The result: a quiet restful sleep. You can do a simple experiment to test this principle by relaxing your jaw and making a snoring noise, then pushing your lower jaw forward and trying to make the same snoring noise.