Orthodontics is the use of scientific methods to align malformed teeth. Through orthodontic treatment, the goal is to achieve an aesthetically pleasing appearance, healthy function, and stable dentition. Malocclusion has those hazards? 1, teeth are not aligned to brush the teeth, so it is easy to grow caries and tartar, affecting dental and periodontal health. 2, the upper and lower occlusal relationship is not good, chewing function decline, aggravate the burden on the stomach and intestines, will affect the function of the digestive system and general health. 3.Serious malocclusion, such as open and reverse occlusion, will affect the pronunciation and daily language communication, and cause a lot of pressure on the psychology. 4.It affects the appearance of the face. Malocclusion will grow into pocket teeth, tile knife face, will make the face left and right asymmetry. 5.Some children and teenagers are ridiculed by their classmates or buddies because of their bad-looking teeth, which may cause low self-esteem and affect their mental health.