Despite its many advantages in terms of patient comfort, less periodontal damage and shorter chair time, direct bonding of molar teeth is not commonly performed in fixed orthodontic treatment. A 2002 U.S. study showed a higher prevalence of banded vs. bonded molars.7 This finding is probably related to studies that evaluated the bonding of tubes, and demonstrated decreased bond strength8 and increased percentage of clinical failures3 in these tubes than in brackets bonded in the anterior region of the dental arch. Tubes bonded to molars using self-cure3,18 or light-cure resins9,10 showed around 14% of failure. According to the authors, these results may be related to (a) difficulty in maintaining proper isolation of the region, (b) inadequate adaptation of the attachment base to the tooth surface, (c) stronger masticatory forces, (d) different etching times, and (e) individual variations related to enamel composition.8