eristic:1. Reduce the friction between arch wire and bracket, it’s help for movement of orthodontic teeth.2. The bracket self-ligating can shorten the course of treatment and finish it in advance. The traditional bracket orthodontic treatment takes at least one and a half years to two years. The treatment of self-ligating bracket orthodontic treatment can be achieved in abou one year.3. Extend subsequent visit time: it needs abou 4 weeks to subsequent visit for the traditional fixed orthodontic