Due to the different experience of doctors and the mastery of orthodontic techniques, the methods used in the clinic also vary, including square arch orthodontic techniques, straight arch orthodontic techniques, lingual aligner techniques, etc.: a. Square arch orthodontic techniques There are two main features, one is the ability to effectively control the movement of orthodontic teeth in all directions. Second, because there are brackets on each tooth and the arch wire is embedded in the groove and fixed by the ligature wire, the dental arch is connected by the arch wire into a whole, which has a large supporting force, so it can reduce the displacement of the supporting teeth, and intermaxillary traction is carried out in the case of the upper and lower dental arches into a whole, which is conducive to the correction of the position of the dental arch and jawbone relationship. However, because the square arch orthodontic technology requires the arch wire to bend various curves to match the orthodontic treatment, which makes the chairside operation time longer and the oral cavity not easy to clean, and if the curves bent by the doctor are not standard, it is not conducive to orthodontic treatment. The main feature is that according to the anatomical position of different teeth, a certain angle is preset on the brackets of the aligner, so it is not necessary to bend the first, second and third sequence of bends on the arch wire as in the case of the square arch aligner, and a straight arch wire with the basic shape of the dental arch is placed into the brackets to complete the labial-lingual, near-distal-medial, vertical and root-control movement of the teeth. The brackets are used to position the teeth and rarely bend the archwires, which not only simplifies the clinical operation and shortens the consultation time, but also avoids the back and forth movement of the teeth caused by the bending error of the archwires, making the positioning of the teeth more precise and rapid, and shortening the treatment course. It is the most clinically used orthodontic appliance. Lingual braces The advantage of lingual braces is that the brackets are placed on the inner side of the teeth – the lingual side – and no traces of orthodontics can be seen from the outer side of the teeth, which is the biggest advantage of lingual braces. Lingual braces are more suitable for adults, such as teachers, flight attendants, actors, etc., who have high aesthetic requirements. However, due to the technical difficulty of lingual orthodontics, the cost is higher. Fourth, self-ligating brackets braces 1, this bracket shape small, beautiful, good security, and change the traditional practice of ligature wire ligature fixed orthodontic archwires, the application of self-ligating brackets without ligature, avoiding damage to the soft tissue of the patient at the end of the ligature wire, greatly reducing the chairside operation time. 2. The increased freedom of the archwires in the self-ligating brackets reduces the friction between the archwires and the brackets and facilitates the movement of the orthodontic teeth, thus shortening the treatment course and making it possible to shorten the total treatment course by 1 to 4 months. The follow-up period of self-ligating brackets can be lengthened to as long as 8 weeks, saving patients’ time costs and reducing the number of follow-up visits. This is all part of the appeal of self-ligating brackets. 3. It allows us to move the teeth at a light force level instead of gravity, so the patient will not feel pain and discomfort, making it easy and pleasant for the patient to receive treatment. 4. The orthodontic process in self-ligating brackets is conducive to maintaining oral hygiene and protecting the health of periodontal tissues, and the orthodontic effect is more stable and less likely to recur. It is one of the most popular orthodontic appliances at present. Self-ligating brackets are especially suitable for orthodontic treatment for busy adults and students who go to school abroad because they can be reviewed once every two months (8 weeks). Five, ceramic bracket aligners 1, beautiful, not easy to detect, with the use of transparent ligature ring more beautiful and comfortable. 2, imported material processing, high production technology, fine workmanship, bracket angle precision. 3, aligner adjustment force is convenient, compared to ordinary brackets orthodontic treatment can shorten the course, the operation of high technical requirements, the effect is ideal. 4, bracket bonding surface and tooth surface curvature consistent, large bonding area, strong adhesion, more tight, solid bonding. 5, the surface of the aligner is smooth, rounded, does not stimulate the gums, the friction on the lip and cheek tissues is small, not irritated, feel comfortable. 6, the orthodontic appliance chemical performance is stable, not corroded by the oral environment, completely non-toxic side effects on the organism. 7, does not affect the pronunciation, does not affect the chewing of food, can be corrected for a variety of deformities, and the orthodontic effect is good. Ceramic fixed aligners that is, the brackets of the aligners are ceramic, its colorless and transparent, beautiful, can make you always maintain a confident smile during the treatment. 8, oral hygiene is easy to maintain, does not affect daily life and work, cost-effective. Ceramic transparent brackets are suitable for: irregular teeth, more serious malocclusion, etc., especially for people with high aesthetic requirements. Six, invisible braces Orthodontic braces are made of transparent polymer material, almost invisible when wearing orthodontic devices. Orthodontic braces use advanced computer-aided design technology and manufacturing process to provide a high-precision micron-level guarantee for the implementation of the doctor’s treatment plan, which is currently the most effective bracketless invisible orthodontic technology. The treating doctor can preview and design the entire orthodontic procedure and plan based on a 3D computerized tooth model. No brackets, archwires and other traditional orthodontic devices are used, which makes it comfortable to wear and mild foreign body sensation in the mouth; also the precision movement and rotation control makes it more comfortable for patients. It is convenient for daily life, work and social events, while avoiding the inconvenience and embarrassment caused by traditional orthodontic appliances. They can be removed freely when eating, brushing and cleaning teeth. Braces can be removed for easy cleaning and to maintain oral hygiene. There is no need to worry about gingivitis, tooth demineralization and discoloration caused by unhygienic orthodontic appliances. Because of the clever design, fine fabrication and special materials of invisible aligners, the cost is more expensive.