An orthodontic apparatus for installation in a patient's mouth, the apparatus comprising: a first extension wire including a proximal portion and a distal portion, the proximal portion extending from a right attachment member and manipulatable to apply a corrective buccal force on the upper right posterior DAC within the patient's mouth when the apparatus is installed in the patient's mouth, the distal portion extending from the proximal portion and manipulatable to apply a corrective labial force on the upper anterior DAC within the patient's mouth when the apparatus is installed in the patient's mouth, the distal portion terminating at a distal end on a side of the mouth opposite from the proximal portion and manipulatable to apply a corrective buccal force on some upper left posterior DAC; a second extension wire including a proximal portion and a distal portion, the proximal portion of the second extension wire extending from a left attachment member and manipulatable to apply a corrective buccal force on the upper left posterior DAC within the patient's mouth when the apparatus is installed in the patient's mouth, the distal portion of the second extension wire extending from the proximal portion of the second extension wire and manipulatable to apply a corrective labial force on the upper anterior DAC within the patient's mouth when the apparatus is installed in the patient's mouth, the distal portion of the second extension wire terminating at a distal end on a side of the mouth opposite from the proximal portion and manipulatable to apply a corrective buccal force on some upper right posterior DAC; and a palatal archwire including a right portion, a middle portion, and a left portion, the right portion extending from a right side of the middle portion to the right attachment member, the left portion extending from a left side of the middle portion to the left attachment member, the right and left portions (112, 116) including a generally U-shaped configuration, the middle portion including a generally M-shaped configuration that comprises a left loop, a middle loop, and a right loop, each of the left and right loops (118, 122) including a generally inverted U-shaped configuration, the middle loop including a generally inverted Ω-shaped configuration, the middle portion disposed between the first and second extension wires (102, 104) and a horizontal axis extending through each of the right and left attachment members, the middle portion being located anterior to both right attachment member and left attachment member when the apparatus is installed in the patient's mouth, the middle portion disposed within a palate when the apparatus is installed in the patient's mouth, the palatal archwire manipulatable to apply a corrective transverse force on either or both sides of the posterior DAC when the apparatus is installed in the patient's mouth. a first extension wire including a proximal portion and a distal portion, the proximal portion extending from a right attachment member and manipulatable to apply a corrective buccal force on the upper right posterior DAC within the patient's mouth when the apparatus is installed in the patient's mouth, the distal portion extending from the proximal portion and manipulatable to apply a corrective labial force on the upper anterior DAC within the patient's mouth when the apparatus is installed in the patient's mouth, the distal portion terminating at a distal end on a side of the mouth opposite from the proximal portion and manipulatable to apply a corrective buccal force on some upper left posterior DAC; a second extension wire including a proximal portion and a distal portion, the proximal portion of the second extension wire extending from a left attachment member and manipulatable to apply a corrective buccal force on the upper left posterior DAC within the patient's mouth when the apparatus is installed in the patient's mouth, the distal portion of the second extension wire extending from the proximal portion of the second extension wire and manipulatable to apply a corrective labial force on the upper anterior DAC within the patient's mouth when the apparatus is installed in the patient's mouth, the distal portion of the second extension wire terminating at a distal end on a side of the mouth opposite from the proximal portion and manipulatable to apply a corrective buccal force on some upper right posterior DAC; and a palatal archwire including a right portion, a middle portion, and a left portion, the right portion extending from a right side of the middle portion to the right attachment member, the left portion extending from a left side of the middle portion to the left attachment member, the right and left portions (112, 116) including a generally U-shaped configuration, the middle portion including a generally M-shaped configuration that comprises a left loop, a middle loop, and a right loop, each of the left and right loops (118, 122) including a generally inverted U-shaped configuration, the middle loop including a generally inverted Ω-shaped configuration, the middle portion disposed between the first and second extension wires (102, 104) and a horizontal axis extending through each of the right and left attachment members, the middle portion being located anterior to both right attachment member and left attachment member when the apparatus is installed in the patient's mouth, the middle portion disposed within a palate when the apparatus is installed in the patient's mouth, the palatal archwire manipulatable to apply a corrective transverse force on either or both sides of the posterior DAC when the apparatus is installed in the patient's mouth.