Figure 3. Treatment progress. A, Simple tubes were bonded using the transfer tray and an additional wire segment was inserted into the gingival simple tubes bonded on the maxillary left central incisor, lateral incisor, and canine. B, After 2 months of treatment, an occlusal simple tube was bonded on the maxillary left lateral incisor. C and D, After 5 months of treatment, lingual simple tubes were bonded on the maxillary left central and lateral incisors, as well as the canine. E, Simple tubes were bonded passively on the lingual surfaces of the maxillary left central incisor and canine, and another simple tube was positioned occlusally and lingually from the tooth surface of the lateral incisor (green color). As the wire deflection is resolved, buccal root torque will be achieved (blue color). This illustration of three teeth was made using micro computed tomography scan images of extracted teeth from different patients. 2M, 2 Months; 5M, 5 months.