Misalignment of teeth in the mixed dentition period is usually manifested as “whistling teeth”, “pocket teeth”, “open bite” and other symptoms, which can affect the development of the jawbone, and if not treated in a timely manner can lead to If not treated in a timely manner, it can lead to jaw developmental deformities, and in severe cases, surgical treatment is required after adulthood, so timely orthodontic treatment is required, usually with local or functional braces. The teeth of the permanent teeth are not aligned, usually do fixed orthodontic treatment, is often referred to as wearing “braces”, “braces” is also called fixed orthodontic appliances. Ordinary orthodontic braces take about two years to correct, usually once a month for a follow-up visit, and each visit takes a long time, and oral comfort is low. Currently, self-ligating braces are more popular and feature a treatment time of about one and a half to two years, with one and a half to two monthly visits, with a short follow-up time and a comfortable mouth. It is very suitable for student patients.