@blm1007blm1007 Here is the device I use. It goes over upper and lower teeth, with a hinge at the back, and you use rubber bands like on dental braces, to hold the device closed. It is done by a special dentist (mine usually treats TMJ, but is trained on this device as well) to treat mild to moderate sleep apnea without a CPAP machine.
I use the one on the left, with interchangeable hinges. It only took me about two weeks to adjust to it. You need to be evaluated first for sleep apnea, but then it is covered by Medicare Part B as durable medical equipment. With my supplement, my copay was $0. The hardest part was getting scheduled with a dentist who accepted Medicare - I finally got seen through my large multi-disciplinary practice, but it took a few months to get in. Dry mouth is in my rear-view mirror now! What a joy.