Is it possible to modify facial growth to our advantage during orthodontic treatment? For years, orthodontists have used functional appliances and headgear in an effort to change the jaw relationship. As practitioners, do we actually have the ability to modify growth, or we still at the mercy of Mother Nature during our patients' formative years? The speaker will summarize the current knowledge in Class II growth and development and the techniques in harnessing growth in Class II patients. Successful and unsuccessful cases treated with the Herbst appliances will be reviewed in an effort to find solutions for growth-modification challenges.