Abstract: Disclosed is a bidirectional jaw displacement oral appliance that is worn in the mouth of a user to reduce the effects of snoring and sleep apnea. The oral appliance includes an upper arch tray assembly against which the user's upper set of teeth are received and a lower arch tray assembly against which the user's lower set of teeth are received. An intermediate arch tray assembly is located between the upper and lower arch tray assemblies. The upper arch tray assembly is hingedly connected to the intermediate arch tray assembly so as to be rotatable with the user's upper set of teeth upwardly relative to the intermediate arch tray assembly. The lower arch tray assembly is adapted to move with the user's lower set of teeth in a horizontal direction relative to the upper and intermediate arch tray assemblies by which the user's lower jaw is advanced relative to the user's upper jaw to maintain an airway to the user's throat.