Earl's Pearls wires are held in place with either one AlastiK or one SS ligature. The intrusion arch does not have to be inside a slot or tied to every incisor to work. If attached distal to the lateral incisor, the intrusion vector is very close to the center of resistance (minimizes labial tipping). The friction of the base arch also resists anterior flaring and spacing. The auxiliary intrusion arch is allowed to work up to and including my third base leveling arch (0.18 × 0.18 NiTi). By that time the arch is typically leveled. The expected side effect is some eruption and uprighting of the molar since the intrusion lever arm applies a mild distal tipping vector to the buccal segment (too much tipping = too much activation). Restrict Mandibular Molar Extrusion or Mandibular Rotation? If I want to stop any molar eruption or mandibular rotation, I place a posterior bite block. Then all bite opening is caused solely by anterior intrusion. If increased lower facial height is desired? If Mandibular clockwise rotation or molar extrusion is OK, then place an anterior " Turbo " bite block (also made from Triad light cure composite). I have found, by accident, that you only need to put a bite block on one incisor. Intrusion Only? If you want to just intrude the incisors and not level the entire arch, use posterior bite blocks and don't use any base leveling arch. If you are worried that the intrusion arch will tip the lower first molar distally, use less force or extend the stainless intrusion arch back to include both molars as vertical anchorage. Once the anteriors are intruded, you can band and level the rest of the arch as indicated. P.S. You can also use this technique on the upper arch. This clinical pearl is reprinted from an original article published previously by Dr. Earl Johnson in the Bulletin. 44 PCSO Bulletin Spring 2023