Normally, orthodontic treatment does not cause headaches. After orthodontic treatment, there may be discomfort from wearing wires and your mouth may become sore, but you will not experience headaches. Orthodontics is the use of brackets and archwires to apply a slow, sustained external force to the teeth, causing them to slowly move and realign, thus restoring the aesthetics of the mouth. This treatment is only for the teeth and has no adverse effect on the rest of the body, so it will not cause headaches. If you have a headache, it may be caused by other reasons, such as colds, fever and other reasons, this situation should go to the local hospital in a timely manner.