Orthodontic treatment does not necessarily require tooth extraction. However, whether or not extractions are needed depends on the patient’s specific situation, and if the teeth are severely crowded, extractions are usually necessary. Methods of straightening teeth usually include conventional orthodontics and invisible braces. If it is a skeletal deformity, surgical correction, i.e. orthodontic surgery and orthognathic surgery, is usually required to correct the dental abnormality. Straightening teeth usually does not require tooth extraction, and if it does, it is usually because of crowded, severely disorganized or irregularly aligned teeth. If you choose to use braces to straighten your teeth, it is important to take care of your braces in your daily life. Pay attention to oral hygiene and brush your teeth promptly after eating any food to ensure that your mouth is clean. Try not to eat hard, sticky and other foods, so as not to cause damage to the aligners. If teeth need to be extracted during the orthodontic process, it is recommended to have a light diet for one week after the extraction, mainly liquid food. If malocclusion occurs, it should be taken seriously and treated in a timely manner by visiting the hospital and following the doctor’s instructions.