Orthodontics is a discipline of dentistry that focuses on the diagnosis, prevention and correction of malpositioned teeth and jaws. It is majorly used to treat malocclusions and the control and modification of facial growth. The majority of orthodontic appliance therapy is done using fixed appliances and removable appliances. There are two main types of orthodontic appliances: active and functional. Active appliance is the tool that is used to apply forces to the teeth in order to change its relation. Functional appliances can be used to correct the occlusion when there is a maxillary over jet and class II occlusion. Aesthetics, oral health, stability and function are some aspects that should be kept in mind while planning treatment for a patient. The book studies, analyzes and upholds the pillars of orthodontics and its utmost significance in modern times. It presents researches and studies performed by experts across the globe. This book will prove to be immensely beneficial to students and researchers in this field.