The science of Orthodontics gave rise to the "retention and relapse" issue, which is still a chronic difficulty for researchers and practitioners in the field. The chapters on retention and relapse have been included in the writings of the majority of Orthodontic textbook authors, from Angle to the current writers. Maintaining an intact dentition becomes a key objective of Orthodontic therapy because accurately defined relationships necessitate the full complement of teeth in both arches. The goal of Modern Orthodontics is creation of best balance among occlusal relations, dental and facial esthetics, stability of the results and its long term maintenance and restoration of dentition.