An appliance, a system and a method prevent snoring of a patient. The appliance opens an airway of the patient by advancing a lower jaw of the patient. A slot is formed on an upper shell and/or a lower shell of the appliance to receive teeth of the patient for wearing the appliance. A hinge connects the upper shell to the lower shell and resists the closing of the mouth of the patient to maintain the open airway of the patient. Wedges protrude from the hinge between the upper shell and the lower shell to further resist the closing of the mouth of the patient. Extended margins may receive liner material to secure the appliance to the dentition. Lingual extensions on the lower arch help to maintain the lower jaw in a forward position relative to the upper jaw.
