The device seems to be working. If you cannot tolerate a cpap machine then I recommend using this device if you have no other options. I have noticed several side effects; The bottom plate keeps slipping out of place every time, you laugh, sneeze, cough, yawn and it's very annoying. It also causes mouth ulcers, dry mouth, leaves a plastic taste in mouth and it feels like plastic is breaking down and being absorbed by the body and hope in future they use non toxic more durable plastics that doesn't break down into the body. If these issues are addressed I would give it 5 stars.
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