A headgear is an orthodontic appliance attached to dental braces that aid in correcting severe bite problems. The headgear is attached to the braces and is anchored from the back of the head, neck or forehead. Its purpose is to stop the upper jaw from growing and to distalize the upper molars, hence preventing or correcting overbite. The type that is anchored on the forehead is used to move the upper molars, hence correcting or preventing underbite. There are two different headgears, one to correct overbite (cervical headgear) and one to treat underbites (reverse headgear). Headgear should be worn 10 - 14 hours daily, typically at night, or as directed by your dentist.