Xiao Lin is a lively and cute little girl who is in the fifth grade, but her abominable “capped” teeth made her teased by her classmates and she often covered her mouth with her hands to hide her sunken upper teeth and capped lower teeth. She came to our orthodontic clinic and found me. After more than a year of orthodontic treatment without tooth extraction, her upper and lower front teeth were completely straightened. So she brought her classmate Yin Hui to orthodontics as well, but Xiao Hui’s situation was very different from Xiao Lin’s. Xiao Hui’s upper and lower teeth were crowded, and her upper front teeth were like two rabbit teeth, with obvious anterior protrusion and open lips and teeth. Therefore, I suggested that Xiaohui should have her upper and lower four front molars extracted for orthodontic treatment, using the extraction gap to bring back the protruding teeth, and using the extraction gap to adjust the occlusal relationship of the posterior molars. Yin Hui’s parents were confused as to why Lulin looked more unsightly but the orthodontic treatment was simpler and did not require extraction, but Xiao Hui had to have the next four teeth extracted and the orthodontic treatment time was relatively longer in order to correct the rabbit teeth with a protrusion in front. This question relates to the fact that each patient has a different malocclusion and therefore the orthodontic treatment plan is correspondingly different. To summarize, the manifestations of malocclusion are bicuspid protrusion and maxillary protrusion (whistling teeth), mandibular recession, mandibular retrusion (enamel), crowded teeth misalignment, anterior teeth opening, etc. For different misalignment manifestations and different etiologies, we take appropriate treatment measures. 1, for children with enameled teeth, we advocate early orthodontic treatment, at the age of about four years old, wearing movable orthodontic appliances in the upper jaw or gluing a beveled guide plate in the lower jaw anterior teeth to guide the upper anterior teeth outward and the lower anterior teeth inward to correct the anticlusion. During the period of tooth replacement, the above method is also used if it is a simple dental retrusion. If it is a bony retrusion, during 8-11 years of age, the retrusion can be corrected by wearing a mask at night and using anterior traction to stimulate the growth of the maxillary bone. If the patient is fully edentulous, the only way to compensate for the depression of the middle part of the face is by orthodontics. In severe cases, orthodontic surgery can be performed to correct the bone disproportion. 2, for patients with open fit, orthodontic treatment orthodontic effect is more stable during the growth period, around 12 years old for women and 14 years old for men, whether to extract teeth orthodontically depends on the specific situation. Severe patients, it is best to orthodontic surgery and orthodontic correction together with treatment. At the same time, the child should cooperate to break the bad habits such as spitting out the tongue and mouth breathing. And chew oral candy every day to exercise the bilateral facial muscles. 3, for patients with normal upper jaw but receding lower jaw, you can bring a movable aligner to guide the lower jaw forward during the period of tooth replacement, and then after tooth replacement, perform the second phase of fixed orthodontic treatment. 4, for the most common whistling teeth, it is recommended that about 12 years old for females and 14 years old for males orthodontic treatment for the best results. Whether to extract teeth according to the specific situation of each patient analysis. For bony protrusions, especially in adult patients, orthodontic surgery coupled with orthodontic orthodontic treatment works best. During the orthodontic procedure, some patients need micro-implant pins and some need aids such as head caps in order to achieve good results. I fully understand the demands of patients and parents who come for orthodontic treatment and what they want to change. Before orthodontic treatment begins, I take molds, photographs and X-rays of the patients, and then analyze these data together to determine the type of misalignment, the cause, and to make individualized orthodontic treatment plans for each patient according to the patient’s stage of growth and development and whether there is potential for growth and development, to ensure that treatment proceeds in an orderly manner. Moreover, the end of orthodontic treatment and the removal of braces does not mean that our work is done. After the orthodontic treatment is finished and the braces are removed, we will take impressions, photographs and X-rays of the patient. We will compare the results with the preoperative period to determine the effectiveness of the treatment. Patients are also instructed to wear their retainers on time and to come back for regular follow-up visits to observe the changes in their teeth and give guidance accordingly.