When Is Headgear Used? It is almost very orthodontic patient’s nightmare that their bite alignment will involve having to wear headgear. Many people are confused as to why some people wear them at all, and what they are supposed to do. Headgear is very rarely used at all, but when it is, it is only if there is a correction of a very severe problem. it is only used in the correction of an overbite, which is a very rare condition.