A Quard Helix is a device for the upper teeth that is cemented in the mouth. The expander works by gently pushing the teeth outwards to eventually widen the upper arch. A Quard Helix expander is usually given to those who have a narrow top jaw, a cross bite and/or crowded teeth.The Quard Helix provides continuous, controlled force for a variety of applications. And it may be used for rotation or stabilization of molars, expansion or contraction of the arch, and even to assist in thumb, finger or tongue habit control. The principle advantage of the Quard Helix is that it allows for a different amount of expansion in the anterior and posterior region of the arch. The appliance can either be soldered to the bands or attached via vertical or horizontal brackets.