A quad helix is an orthodontic appliance for the upper teeth that is cemented to the upper six year old molars. It is attached to the molars by two bands and has four springs or helices that widen the arch of the mouth to make room for crowded teeth, or correct a posterior cross-bite, where the upper jaw is narrower than the lower. After a short adjustment period the quad helix becomes quite comfortable to wear. It is fixed in place and can be adjusted by the orthodontist at each check visit.