Orthodontic methods are as follows: 1, metal fixed orthodontic appliances, such appliances are pasted on the lip side of the teeth, slight force control of the teeth, to achieve the effect of orthodontic correction, the advantages are mainly affordable, and such appliances have a long history, stable efficacy, better three-dimensional control of the teeth; 2, semi-invisible orthodontic treatment, i.e. ceramic orthodontic appliances, the color of which is more close to the natural teeth, more aesthetically pleasing, but Corrective arch wire is still metal material, so it is called semi-invisible aligners; 3, no bracket invisible aligners, is the new development of orthodontic technology in recent years, is through the computer three-dimensional design and production, so as to produce a series of transparent aligners, the patient can take off and wear by themselves, reduce the number of follow-up visits, but the price is relatively high.