Some embodiments of the present disclosure include a dental appliance for treating/preventing sleep apnea and snoring. The dental appliance may be a wedge-shaped device designed to be positioned between the lower and upper jaw, wherein the device is thicker within a front area of the mouth and thinner within a back area of the mouth. The device may include upper and lower teeth channels to accommodate the teeth and a plurality of breathing ports positioned between the upper and lower teeth channels, the breathing ports being configured to allow a user to breathe through the ports while the appliance is in use. The appliance may force the mouth and airway into an unnaturally open position without requiring the lower jaw to be displaced forward. A tongue rest may extend through the device to support the tongue, while simultaneously providing slight upward pressure on the tongue to further open the airway.