Orthodontics Defined
Orthodontics may be the specialty of dentistry that's concerned using the study and treatment of malocclusion (improper bites), which may be a result of tooth irregularity, disproportionate jaw relationships, or both. Orthodontic therapy can focus on dental displacement only, or can deal using the control and modification of facial growth. In the latter case it is better defined as "dentofacial orthopedics". Orthodontic therapy can be carried out for purely aesthetic reasons with regards to improving the general appearance of patients' teeth. Nevertheless, you will find orthodontists who work on reconstructing the whole face rather than focusing exclusively on teeth. Therapy is also frequently prescribed for practical reasons for example providing the patient having a functionally improved bite (occlusion).
Your real decision is whether you want to be a physician or a dentist. Specialization comes later, after medical or dental school.
You need a college education first, before you can start any professional school. Worry about getting into a good college for now.
One thing to consider: no emergencies in orthodontics. You keep your nights and weekends for yourself.