Orthodontics involves correcting teeth alignment and positioning. It aims to achieve functional efficiency, structural balance, and esthetic harmony through treatments like preventive, interceptive, corrective, and surgical orthodontics. Edward Hartley Angle is considered the father of modern orthodontics. He developed classifications of malocclusions and appliances like pin and tube and edgewise appliances. Other contributors included Calvin Case, Martin Dewey, Holly Broadbent, Raymond Begg, and Rolf Frankel who developed growth guidance appliances.