A dental device comprising: a first arch configured to engage at least some of the teeth of a user's lower dental arch, the first arch having a midline that aligns substantially with the anterior midline of the user's mouth when the first arch is inserted in the user's mouth; a first coupler coupled to the first arch along the midline of the arch, a portion of the first coupler configured to be inside the user's mouth when the first arch is inserted in the user's mouth; a second arch configured to engage at least some of the teeth of the user's upper dental arch, the second arch having a midline that aligns substantially with the anterior midline of the user's mouth when the second arch is inserted in the user's mouth; a second coupler coupled to the second arch along the midline of the second arch, the second coupler configured to extend anterior to the user's second dental arch when the second arch is inserted in the user's mouth; and a flexible tension element configured to removably engage the second coupler and the first coupler, the tension element configured to maintain a forward position of the first arch relative to the second arch, wherein the second coupler comprises: a flange coupled to the second arch ; a post coupled to the flange , the tension element configured to engage the post ; and a cap configured to removably engage the post , the cap configured to prevent the tension element from disengaging from the post when the cap and the tension element are both engaged with the post . a first arch configured to engage at least some of the teeth of a user's lower dental arch, the first arch having a midline that aligns substantially with the anterior midline of the user's mouth when the first arch is inserted in the user's mouth; a first coupler coupled to the first arch along the midline of the arch, a portion of the first coupler configured to be inside the user's mouth when the first arch is inserted in the user's mouth; a second arch configured to engage at least some of the teeth of the user's upper dental arch, the second arch having a midline that aligns substantially with the anterior midline of the user's mouth when the second arch is inserted in the user's mouth; a second coupler coupled to the second arch along the midline of the second arch, the second coupler configured to extend anterior to the user's second dental arch when the second arch is inserted in the user's mouth; and a flexible tension element configured to removably engage the second coupler and the first coupler, the tension element configured to maintain a forward position of the first arch relative to the second arch, wherein the second coupler comprises: a flange coupled to the second arch ; a post coupled to the flange , the tension element configured to engage the post ; and a cap configured to removably engage the post , the cap configured to prevent the tension element from disengaging from the post when the cap and the tension element are both engaged with the post . a flange coupled to the second arch ; a post coupled to the flange , the tension element configured to engage the post ; and a cap configured to removably engage the post , the cap configured to prevent the tension element from disengaging from the post when the cap and the tension element are both engaged with the post . <EOS>