Features:* The ideal dental arch track， moderate forces.* Without repeated visits.* Patients can take on and off by themselves.* Short treatment cycle and never rebounded.* Avoid the trouble and inconvenience causing by Arch wire training， especially for man who cannot achieve Arch wire training.* No harm to the teeth and oral soft tissue. Note:-Tooth orthodontic is a long process， please be patient for the effect.-The product is made of medical plastic and there is a little plastic smell odor，please rinse with saline or toothpaste before using.