Tooth and jaw deformities not only affect people's facial beauty, but also sometimes cause mental and psychological obstacles, making you feel unhappy and inferior; Severe dentofacial deformities affect oral function, making people unable to chew food fully; Some dentofacial deformities and unclear pronunciation affect daily communication with people, so orthodontics has become a "messenger" to save teeth. Orthodontics is to treat malocclusion through orthodontics or surgery. Malocclusion refers to the deformity of teeth, jaws and craniofacial surfaces caused by congenital or acquired factors during the growth and development of children. Malocclusion, dental caries and periodontal disease are three common diseases in oral cavity. So, why do you have to pull out your teeth before orthodontics? In some more formal stomatological hospitals, doctors will ask patients to have routine blood tests and liver function tests before orthodontic treatment. The purpose of blood examination is to help orthodontists understand the general health status of patients, and to screen and eliminate blood system diseases. In this way, orthodontists can make a correct diagnosis according to the specific conditions of patients, formulate treatment plans, and take corresponding measures for some special patients to reduce the possibility of danger in their treatment. The second purpose of blood test before treatment is to screen hepatitis B. China is a big country with hepatitis B. In order to prevent cross-infection of hepatitis B in medical treatment, medical institutions at all levels in China attach great importance to its transmission route. Oral treatment is one of the most dangerous transmission routes of hepatitis B. Therefore, before orthodontic treatment, patients should be screened to find hepatitis B patients, and corresponding disinfection and protective measures should be taken to avoid cross-infection as much as possible to protect the life and health of other malocclusion patients. Finally, Astor experts remind you that you must choose a regular plastic surgery hospital for orthodontics. [Editor: Rowling]