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Welcome to Midway Dental Laboratory website, we are always ready for your needs of low price and high quality quad helix made in China and China quad helix, dental quad helix.The quad helix is an appliance made of metal wires that attach to the upper first molar bands. The wires run along the top of your mouth and are joined together by four loops (hence, quad helix). The loops are designed to make the appliance more flexible. The purpose of the quad helix is to expand and rotate the upper molars. This appliance is not removable