Lingual orthodontic technology is a popular white-collar invisible orthodontic technology that has emerged in recent years. Different from the traditional aligners (braces) located on the outer side of the teeth (labial side), lingual aligners (braces) are located on the inner side of the teeth (lingual side), which can have the effect of invisibility. Compared with the traditional braces, its advantages are as follows: 1, highly invisible: only when the head is lowered or tilted up and smiled, you can see the lower or upper jaw braces, and in other cases, you can’t see them in general. There was a college student from the beginning of orthodontic treatment to the end of orthodontic treatment, dormitory classmates even do not know that he is orthodontic teeth. 2, more conducive to aesthetics: the traditional lip-side aligners due to the patient’s oral hygiene to maintain poor factors, resulting in the outer surface of the teeth (lips and cheeks) appeared chalk-colored demineralization, a serious impact on aesthetics, and the lingual side of the aligner is located in the inner side of the teeth, will not affect the external surface of the teeth of the degree of smoothness. 3, personalized service: bracket indirect bonding technology, so that bracket positioning on the teeth more accurate. It should be noted that: 1. The time needed for lingual orthodontic treatment cannot be shortened, and the follow-up period and treatment time are more or less the same as that of labial orthodontic treatment. 2. The cost of lingual orthodontic treatment is higher than that of labial orthodontic treatment. 3, lingual orthodontic treatment also needs patients to maintain good oral hygiene according to the doctor’s requirements.