Abstract: An external mandibular advancement splint is provided for advancing a wearer's jaw forward during sleep, thereby opening the airway and limiting the obstruction causing snoring or sleep apnea. The external mandibular advancement splint includes an external member having one or more arms, an advancing mechanism, and at least one stabilizing strap. The stabilizing strap is attached to a distal end of the one or more arms to anchor the external member on a wearer's mandible. The arms are adapted to engage with at least a portion of a wearer's mandible and each end of the arms are operably connected to the advancing mechanism. The arms and the advancing mechanism create a fulcrum thereby providing tension to the external member. The tension causes the advancing mechanism to pull the mandible in a direction that alleviates airway constriction.