This seminal text by orthodontic pioneer Edward Hartley Angle remains one of the most authoritative and influential works in the field of dentistry. Angle's groundbreaking research on the classification and treatment of malocclusion of the teeth paved the way for modern orthodontics and established many of the principles and techniques still used today. The book includes detailed discussions of orthodontic diagnosis, treatment planning, and the use of various appliances and devices. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.