I actually know a dentist who is using this, and he recommended it to me to move my maxilla forward a small amount. (I actually thought that it was a joke.) My goodness, it looks uncomfortable. You wear it at night, starting after dinner, and keep it on until you wake up in the morning. It is supposed to be very stable because of the slow process by which things are moved. I don't know anything else, and I would love others opinions. Too me, it looks crazy, but sometimes crazy can be effective.