An orthodontist is a specialist in dentistry restricting their practice only to the treatment of orthodontic problems. An orthodontist has devoted two to three years of full-time comprehensive training at an accredited University or Hospital program in addition to their previous dental training. This advanced training includes topics such as growth and development, genetics, biomechanics, anatomy as well as the clinical skills in the design, application, and control of removable appliances (plates) and braces.