Aim the purpose of this study was to investigate the relationship between the lower incisors crowding and the sagittal position of the chin in adolescents in the Syrian coast Materials and methods sample's study contained mandibular dental study casts, and lateral cephalometric graphs of a pretreatment patients who were undergoing orthodontic evaluation at the Department of Orthodontics and Dentofacial Orthopedics at Tishreen University (18 males and 63 females of Syrian coast origin with mean age of 17.7 years).