A mouthguard includes an integrally molded tray having upper and lower portions joined by a hinge along an inner portion of the tray that defines an open-sided channel gap between the upper and lower tray portions. Shock forces tending to deflect the lower portion of the tray toward the upper portion are countered by a moment resistance of the hinge as the channel gap between the upper and lower tray portions closes. Additional energy absorption is provided by a cushion liner attached to an inner surface of the tray that prevents contact between the upper and lower tray portions, as well as an air cell defined by an occlusal pad attached to the lower tray portion. Embodiments include a detachable tether that is received within a tether mount incorporated within the mouthguard.
