A dual-purpose aligner which can serve as both an engager template and an aligning appliance includes is used for treating a patient according to a predetermined orthodontic treatment plan. The dual-purpose aligner can be seated on the teeth of the patient as an engager template having an engager void which is filled with a predetermined composite for bonding to a tooth of a patient. The engager template aligns the engager void with a corresponding tooth. A light-curing process cures the predetermined composite in the engager void through the dual-purpose aligner appliance to fabricate the engager and attach the engager to the corresponding tooth. The dual-purpose aligner can also be seated on the teeth of the patient as an aligner appliance for moving the teeth of the patient from a first position to a second position according to the predetermined orthodontic treatment plan.
