Now commonly used orthodontic appliances, there are two kinds of movable and fixed. The active orthodontic appliance, basically in the period of milk teeth with a hyperbolic lingual reed three types of patients, patients with anterior teeth rebound, that is, with the pad of this kind, can be removed and washed, cleaned and put back on, the functional orthodontic appliance also belongs to that kind. Like the flat guide, oblique guide these are movable orthodontic appliances, movable orthodontic appliances are sometimes a single use, sometimes with fixed orthodontic appliances, without it is not yet possible, is very necessary, and summed up the clinical experience, many doctors have worked hard to create such an orthodontic method, is now commonly used in the clinic, which is the movable orthodontic appliances. Now more commonly used is the fixed orthodontic appliances, fixed orthodontic appliances are generally used at the age of 12 years or older, the top is glued to the brackets, brackets glued on after 24 hours, until the completion of orthodontic treatment, glued on can not be taken down. It is not so convenient to eat, oral hygiene is not so good, eat the food will hang on, teeth will rot, gums will be inflamed, so require every orthodontic patient to do oral hygiene with him, on the oral hygiene of this article, brush teeth after each meal, morning and evening brush, emphasizing that each patient should brush five times a day, each brush should not be less than 3 minutes, must be clean and dry brush. This patient has a foreign body sensation and irritation to the mucosa, which can cause some local ulcers. The cooperation is not very good patients, can not take it by themselves, 24 hours a day to wear it. There is another kind of invisible braces called bracketless orthodontics, also considered movable, because it can be removed every day to eat, after eating, brush your teeth, rinse your mouth and then put on. There are also lingual orthodontic appliances, which are also fixed orthodontic appliances. Fixed aligners and movable aligners are sometimes flexible and can be mixed and matched. But some patients, such as those in the mixed dentition period, are completely functional patients, then it is straightforward to use functional orthodontic appliances. Generally, most people over the age of 12 are fixed orthodontic appliances, combined with movable orthodontic appliances. Active orthoses, there is another called the front retractor, that is, the patient with a periapical, put the orthosis in front of the mouth to make a device that pulls the rubber band to the top of the mask, pull the front of the maxilla outward, so that it improves the lack of development of the maxilla, directly pull the bone out, the force of the bone pull generally 500g, so that the effect of orthopedic force. These two orthotics, no matter which one, the doctor is certainly used in the case of necessity, is to require a high degree of cooperation from the patient, otherwise the treatment effect will not be achieved.