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What Customers Are Saying. The Zyppah is one of the best anti-snoring devices on the market, and itâs clearly the best mouthpiece by far. That being said, words donât mean much unless they have something to back them up, so weâre going to look at the positive and negative things previous customers have had to say.
Slumber Guard is an anti-snoring device used to help a person stop snoring. Most problem snoring is caused by the lower jaw collapsing into the throat, causing constriction in â¦ the throat airway. The Slumber Guard holds the lower jaw in a slightly forward position keeping the throat airway open.