Headgear is used to guide the direction of tooth movement and/or jaw growth in someone who is still growing. Headgear may be worn before braces are applied, or during any part of orthodontic treatment. There are different types of headgear. The patient inserts the headgear and in most cases, wears it during the evening and at night. Your orthodontist or dentist will show you how to insert headgear, and tell you how long to wear it each day.