Invisalign is an appliance designed and manufactured by Align Technlgy company in North American. It can meet the need of tooth modification, and at the same time to avoid the shortcomings of the traditional bracket correction, which can see " metal mouth ".It is the most advanced orthodontic treatment in the market. The patients just needs to wear transparent braces, then the irregular teeth can be gradually in order. The product has approved by the US Food and Drug Administration (FDA), China's food and drug supervision and Management Bureau (SFDA). Production process is certified by the international organization for standardization (ISO). On technological innovation technology of orthodontic area, it won more than 130 patents, including 3D model software. According to statistics, Invisalign system has been promoted to more than 65 countries. There are more than three million seven hundred thousand users, and more than 96% of patients are satisfied.