The study of esthetics and harmony of the facial profile has been a major concern to the practice of orthodontics from its earliest days. Because treatment mechanics are becoming more effective, there has been an increased emphasis on the soft tissue profile, both in diagnosis and treatment planning. Many orthodontists stress the importance of soft tissue diagnosis. The changes that occur in the soft-tissue profile during orthodontic treatment have played a significant role in the diagnosis and treatment planning process. Although, orthodontists have long recognized that the extraction of premolars often is accompanied by changes in the soft-tissue profile, investigations indicate that the soft tissue does not always respond favorably to hard-tissue retraction.