So far lingual orthodontics was supposed to be extremely difficult to apply and that only a few specialists would have the ability and time to handle the necessary setup for the indirect bonding procedures. The 2D® lingual appliance, which was studied for a long period and successfully applied from the Insubria study group in Varese/ Italy, has the outstanding advantage that it can be applied directly to the mouth of the patient without the need of doing any setup procedure in a dental laboratory. Furthermore this appliance is extremely flat so that the adaption for the patient becomes much easier. With the FORESTADENT 2D® lingual appliance a good portion of all lingual cases can be treated successfully. During the seminar of Dr. Cacciafesta the participants will understand the particular biomechanics of lingual orthodontics, study some cases which were successfully treated and understand more about the need of individualizing lingual archwires.