The purpose of orthodontics usually includes the correction of conditions that affect oral health, affect the digestive system, or help build self-confidence through orthodontics. 1. Affecting oral health: Because uneven alignment of teeth may affect the patient’s oral health, usually for overcrowded teeth, it will be difficult for the patient to clean the gap when brushing, and it is easy to have food debris to form caries. 2. Impact on the digestive system: If the patient has problems with the bite, it may also affect the ability to chew, thus affecting the patient’s digestive system. 3. Build up self-confidence: Usually, orthodontic treatment can also build up self-confidence and make patients look more beautiful, which is good for interpersonal communication in life, study and work. It is recommended that patients who have dental problems should seek medical attention in time and have their teeth straightened under the guidance of a professional doctor.