It is not unusual for molars to erupt into crossbite. A true single tooth crossbite (midlines concomitant no visible mandible shift), can easily be corrected with this simple appliance. Maxillary and mandibular bands are made for the two molars. Hooks are placed on the buccal of the maxillary band and the lingual of the mandibular band, so an elastic force can be used to correct the crossbite. A reciprocal force is applied, moving both molars. If the patient is already in the adult dentition stage, slight occlusal adjustment of the molars (or the use of a bite plane) is often needed during treatment. Once the condition is corrected, normal intercuspation is usually sufficient to maintain the results. Bands (as opposed to direct bond hooks alone) are recommended when significant occlusal interferences are present. Said presence may cause a direct bond bracket to be sheared off the tooth. Note: If only one tooth needs to be moved, the other must be tied to an anchor unit or this approach will not work.