The principle of orthodontics is that by applying light forces to the teeth, the alveolar bone is altered so that the teeth are guided to move in the direction designed by the doctor, ultimately achieving the purpose of orthodontic treatment. Why is orthodontics a holistic, systematic and professional treatment process?1. Holistic. Teeth are a tissue and organ of the human body, part of the human body, so its reconstruction and treatment must take into account the whole. Teeth is the most core part of the lower 1/3 of the human face aesthetics, but also the most focus of the human smile, so the beauty of the teeth can not be limited to the basic requirements of the teeth alignment, he must take into account the frontal image, frontal smile image, side image, phase smile image, oblique smile image and other aspects of the coordination and beauty. Therefore, orthodontics is a holistic treatment process. 2, systemic. Orthodontics is mostly minors, so the basic judgment and prediction of the child’s growth and development is required; it is necessary to design a personalized plan for the patient when designing the treatment plan, as well as the basic judgment of the feasibility and final effect of the plan; it is necessary to perfectly implement the personalized plan designed by yourself at each follow-up consultation. These are not a time to complete, these are reflected in each follow-up, reflecting the doctor’s professional level. 3, professionalism. As mentioned earlier, the principle of orthodontics is to guide the teeth to move to the position designed by the doctor by applying light force to the teeth. This is a common and easy to understand words, but the expertise contained therein requires a major university of high talent to study for 8 years (i.e., master’s degree) to be considered basic mastery. First of all, everyone’s teeth are arranged differently, so where should the teeth be designed to move to make sense? This requires specialized knowledge. What is the most reasonable amount of force to add? This requires specialized knowledge. How should the force be added to be most beneficial to the overall treatment? This requires specialized knowledge …… Therefore, orthodontic treatment is a very specialized treatment process.