Wearing braces is a longer process that requires tacit cooperation between the doctor and the patient in order to achieve satisfactory results. Generally speaking, it takes about 2 years for teenagers and 2.5-3 years or even longer for adult orthodontics. So, what preparations need to be made before wearing braces? 1. You need to be clear about what problems you want to solve by wearing braces. Is it uneven teeth or an unattractive facial shape? This will facilitate communication with your doctor to express your opinions and demands; on the other hand, it will help your doctor to design the most suitable solution according to your actual situation. 2. Have a general idea about wearing braces. The principle of wearing braces is that the force acts on the teeth to move them inside the bone, and the premise is that the teeth and the bone need to be located in a more normal position. Crowding, protrusion and gaps are all indications for orthodontic treatment; minor bony deformities can also be improved by moving the teeth through orthodontics, i.e. “masking treatment”. The more serious bony deformity, such as “ground bag”, “small chin”, etc., teeth and bone deviated from the normal position too much, it is necessary to orthodontic – orthognathic surgery combined treatment, from the root of the problem. 3, to know the role of wearing braces. Wearing braces firstly solves the “dental health” problem, and secondly the “aesthetics of teeth and face”, not all aesthetic problems can be solved by wearing braces. For example, patients with serious periodontal disease, due to the poor condition of the teeth, orthodontic treatment is not easy to extract teeth, can only restore the normal bite function as soon as possible, the facial shape may not be able to change. 4, before wearing braces, you should develop good oral hygiene habits to ensure good periodontal status. Orthodontic appliances will increase the difficulty of oral cleaning, in addition to regular dental cleaning in the orthodontic process, should master the correct method of brushing, to minimize tooth decay, gum recession, “black triangle” problem. Patients who have poor oral hygiene and are in the progress of periodontitis cannot be treated orthodontically immediately, and orthodontic treatment can only be carried out after receiving systematic periodontal treatment and stabilization. In addition, it should be understood that due to the protruding facial shape of the yellow race, especially in the Guangdong region; coupled with the aesthetic standard of the general public, the straight face shape of Europeans is considered beautiful. Therefore, considering the combination of misaligned teeth and protruding facial shape, 50%-60% of orthodontic patients in China require tooth extraction treatment. The orthodontist will allocate the extraction space according to the patient’s condition to solve the problems such as crowded or protruding teeth. Therefore, tooth extraction is not a terrible thing.