PCSO is comprised of 11 component organizations and is the largest constituent organization of the American Association of Orthodontists. Our Mission: The Pacific Coast Society of Orthodontists is a professional organization of orthodontic specialists whose mission is to help its members provide the highest level of care to the public by providing quality continuing education, providing a framework for a strong political voice, facilitating two-way communications between the organization and its members, and supporting the successful practice of orthodontics.