First, we will make retainers for patients after the treatment according to their requirements and their specific oral conditions. The first is the traditional Hawley retainer, which is a wire and plastic retainer, somewhat like the dentures worn by the elderly. A wire can be seen on the outside and a base on the inner side of the tooth. This type of retainer can affect pronunciation to some extent due to its large size, but has the advantage of being strong and durable and allows for further self-adjustment of the teeth. The second type of retainer is the transparent pressure film retainer, which has the advantage of being largely invisible, does not affect the aesthetics, is small and comfortable, and has little effect on pronunciation. However, because of the thin material, it is easy to be damaged if not cared for. The third type is the lingual fixed retainer, which is the smallest and most comfortable, fixed on the inner side of the teeth, the retention effect does not depend on the cooperation with the patient, and the aesthetics is also the best, the disadvantage is that it is more expensive, and if the patient does not take care of it or use it improperly, it will cause damage. Among the above three types of retainers, the first two depend on the cooperation of the patient, the third does not require the cooperation of the patient, is fixed on the teeth, but the patient needs to be careful to use, so as not to break. Second, the retainer wearing precautions (mainly refers to the first two retainers) 1, wear retainer, put the retainer into the mouth, first find the right position, and then use your index finger to press it into place (pay attention to in place to be thorough). 2, wearing time is generally two years, the first year requires all day except for eating and brushing teeth 24 hours a day, the second year can be worn half a day (that is, at night when you sleep with it, take it off during the day). 3, Hawley retainer can be used every day with toothbrush and toothpaste to clean the retainer thoroughly, the pressure membrane retainer can be rinsed with water after each meal, please avoid using hot water to clean, because both retainers are plastic products, hot water can make it deformed. 4.Do not wear the retainer when you eat, and when you take off or don’t wear the retainer, you must put it in the box for safekeeping when you go out (the doctor will give you a special retainer box). Retainers are clinker products and cannot be squeezed, cannot be subjected to heat, and definitely cannot be sterilized by taking boiling water to high temperatures. Retainers are often lost in restaurants because they are often forgotten and a retainer box is the best way to prevent damage and loss. If you want to eat warm food, please take off the retainer beforehand to avoid melting and deforming the resin part in high heat, and soak the retainer in water if you don’t use it for a long time. 5.If you experience pain or discomfort when wearing the retainer or if the retainer is broken or lost, please contact your doctor promptly. Please note! There is a fee for redoing the retainer. If you use it carefully and properly, it can be used for many years. 6.You may find it difficult to talk when you first start wearing the retainer, but don’t worry too much, you will soon get used to it. If you have any questions about the retainer, you can contact me at any time, but it is better to have a follow-up appointment every six months or a year (i.e. during summer and winter vacations) so that the doctor can understand the retention situation. 8, if you want to adjust the retainer please contact the doctor, remember not to adjust it yourself, it may damage the aligner.