A mandibular advancement device used in the management of snoring, obstructive sleep apnea, TMD and bruxism and jaw clenching, comprises a maxillary tray for receiving/retaining maxillary teeth, a mandibular tray for receiving/retaining mandibular teeth, and one to two advancement member(s)/prong(s) located on the mandibular tray at the anterior region thereof. The advancement member(s)/prong(s), when in use, contact the outer surface of the maxillary tray in an anterior region thereof, thereby advancing and retaining the mandible and tongue in a protrusive position. Raized occlusal surfaces/bite pads in a region contiguous and posterior to the advancement prong(s) allow a passive tongue retaining gap or space to be formed in the anterior and posterior regions of the device. A lingual retaining strap may be provided between opposite posterior portions of the mandibular tray to passively retain the tongue in a protruded, non-obstructive position.
