The Lip Bumper exerts its force on the mandible to provide more room to the lower arch. This appliance, which forms a barrier between the buccal muscles and the teeth, enables the tongue to push the teeth buccally. Also, by pushing on this barrier, the lip tips the lower molars distally. The appliance is made of a 0.045" labial wire covered with a labial pad on the anterior section. On the posterior section are two adjustable omega loops. The Lip Bumper is inserted on either side into buccal tubes previously soldered to the molar bands.