Freedom to move your jaw up and down, without compromising the effectiveness of the device, is a unique feature of the SomnoDent MAS and actually improves its effectiveness. Not only have numerous clinical trials proven that this appliance works - more trials than any other oral splint - the fact that it is so much more comfortable and less invasive than other devises such as the CPAP, ensures that you will use it! You'll sleep better, wake up refreshed and find yourself experiencing a fuller, more productive life. Isn't it time to try it now?