Abstract: An oral appliance for managing a person's airway and for a more efficient breathing is disclosed. The oral appliance provides greater comfort by maintaining an open air passage through the mouth and by preventing the tongue from blocking the windpipe during sleep. The appliance has a mouthpiece that includes partial tooth trays capable of adjustable multidirectional movements relative to each other. The disclosed oral appliance maximizes the space available for forward and side to side movements of the tongue.