An orthodontic system to be worn adjacent to upper teeth and lower teeth in a mouth of a user wherein the user has an upper jaw, a lower jaw, lips and a tongue wherein the upper teeth have upper incisors and upper molars and the lower teeth have lower incisors and lower molars, the orthodontic system comprising: an upper appliance having an anterior portion and a posterior portion located rearward of the anterior portion of the upper appliance wherein the posterior portion of the upper appliance is shaped to contact the upper molars; a lower appliance having an anterior portion and a posterior portion located rearward of the anterior portion and an outer shield wherein the outer shield extends vertically downward from the lower appliance defining a trough in the lower appliance wherein the anterior portion of the lower appliance is shaped to contact the lower incisors and the lips and the posterior portion of the lower appliance is shaped to contact the lower molars; a tab extending rearward from the anterior portion of the upper appliance wherein in use the tongue is pressed against the upper appliance such that the tab contacts the upper jaw of the user and moves the upper jaw forward relative to the lower jaw when the appliance is worn within the mouth of the user; characterised by a lining in contact with the lower teeth in the trough in the lower appliance wherein the lining adheres the lower appliance to the lower teeth and exerts a force against the lower teeth when the appliance is worn in the mouth of the user; and a bumper that extends from the outer shield of the lower appliance forward relative to the mouth of the user wherein the lips exert a rearward force against the bumper and move the lower jaw rearward relative to the upper jaw when the lower appliance is worn within the mouth of the user. an upper appliance having an anterior portion and a posterior portion located rearward of the anterior portion of the upper appliance wherein the posterior portion of the upper appliance is shaped to contact the upper molars; a lower appliance having an anterior portion and a posterior portion located rearward of the anterior portion and an outer shield wherein the outer shield extends vertically downward from the lower appliance defining a trough in the lower appliance wherein the anterior portion of the lower appliance is shaped to contact the lower incisors and the lips and the posterior portion of the lower appliance is shaped to contact the lower molars; a tab extending rearward from the anterior portion of the upper appliance wherein in use the tongue is pressed against the upper appliance such that the tab contacts the upper jaw of the user and moves the upper jaw forward relative to the lower jaw when the appliance is worn within the mouth of the user; characterised by a lining in contact with the lower teeth in the trough in the lower appliance wherein the lining adheres the lower appliance to the lower teeth and exerts a force against the lower teeth when the appliance is worn in the mouth of the user; and a bumper that extends from the outer shield of the lower appliance forward relative to the mouth of the user wherein the lips exert a rearward force against the bumper and move the lower jaw rearward relative to the upper jaw when the lower appliance is worn within the mouth of the user.