This dental device, the anti snoring mouthpiece, and anti-snoring mouthgurards are not a 100% guarantee snoring solutions for absolutely everyone. It does its job very well, but it can not help very serious cases (especially those who also have sleep apnea) and it surely can not help anyone who has nasal snoring because it literally has nothing in common to do with the nose. Still, this mandibular advancement device has been thoroughly researched in the science and proven to work.