One day, Miss Li approached the orthodontist at Nanjing Stomatological Hospital to tell her concerns about receiving orthodontic treatment. Shy of opening her mouth in public, she had considered orthodontics before. But she hesitated at the thought of wearing those nasty, ugly “braces” and having to face people with an “iron mouth and steel teeth” for two years? So, is there an orthodontic method that does not expose the aligners? In today’s material living standards and cultural tastes of people are improving, people’s aesthetic standards have also improved. Having a neat and healthy teeth has become a pursuit for many people. In the past, many adult patients were reluctant to accept traditional orthodontic appliances exposed on the surface of their teeth for various reasons such as occupation, privacy, and socialization, and regrettably gave up on orthodontic treatment. With the development of orthodontic technology and materials, beautiful plastic brackets and clear ceramic brackets have emerged clinically, but regardless of the degree of transparency used, it is difficult to avoid seeing the aligners from the outside of the mouth. For this reason, after years of efforts by orthodontists and engineers, the orthodontic department introduced lingual braces – an invisible orthodontic technology that relieved Miss Li’s concerns. Lingual orthodontics is an international orthodontic technique that has emerged in recent years. It is orthodontic treatment with the aligners all mounted on the lingual side of the teeth, and almost no orthodontic treatment device can be seen from the outside of the mouth. It does not hinder the patient’s daily life and social activities and achieves an aesthetic effect. When this technology was introduced, it was particularly favored by patients with high aesthetic requirements because of its unique aesthetic factors. However, the lingual braces, which are hidden behind the teeth, may affect the position and movement of the tongue, and the edge of the tongue may feel irritated and uncomfortable, and may have a slight impact on pronunciation. Patients undergoing orthodontic treatment will have to undergo an adaptation process. In addition, the technical operation of lingual braces is complex and difficult, and the cost of the materials used is high, so the cost of treatment is higher than that of general orthodontic braces. In order to avoid the pain of braces, it is important to pay attention to the protection of teeth from an early age. Parents should educate their children to develop the good habit of brushing their teeth every day, and also to protect their baby teeth. If there is a problem with the baby teeth it can cause misalignment of the eruption of the inherited permanent teeth, resulting in misalignment. It is best for parents to take their children to the dental hospital around the age of 10 to check the development and eruption of teeth, so that problems can be detected and dealt with early.