1, 2-3 days after the installation of fixed aligners, the teeth are sore, soft and weak or slightly painful, and the symptoms will disappear on their own in about a week. During this period, you can enter soft and rotten meals. If the pain increases or brackets, rings fall off, in order to ensure smooth orthodontic treatment, you should contact your doctor in time to come to the hospital for treatment to prevent accidents. When the first orthodontic appliance, the oral mucosa will be worn by the orthodontic appliance and ulcers, you can choose the strip of green arrow chewing gum after washing the sugar gum wrapped brackets to protect the mucosa, generally after a week will slowly adapt. 2, in order to avoid aligner loss, do not chew hard food, it is recommended to avoid the following foods: (1) sticky food, (2) hard food, (3) meat with bones, (4) not shelled seafood, (5) too much fiber food, (6) high sugar food. 3, the teeth are not easy to clean after the installation of the aligner, in order to avoid dental caries, gingivitis, periodontitis, please pay attention to oral hygiene. It is advisable to brush your teeth and orthodontic appliances immediately after each meal, even if you eat at school or at work. Do not eat snacks. 4. Brush horizontally to clean the aligners and vertically to clean the teeth. Between the aligners and aligners, you should use the gap brush to clean. For details of brushing method, please refer to “What will happen if teeth are not brushed clean during orthodontic treatment” and “Which toothbrush should be used in orthodontic treatment”. 5.People who wear extra-oral auxiliary devices (extra-oral arch, J-hook, head cap, etc.) should wear them for 12 hours a day, and please pay attention to safety when taking them on and off. 6, wearers of ceramic brackets, please do not eat easily colored food or drinks (tea, curry, coffee, cola, etc.), so as not to coloring affect the aesthetic effect. 7, patients wearing movable orthodontic appliances must strictly follow the doctor’s requirements to wear orthodontic appliances, regular follow-up visits to ensure the effectiveness of treatment. Active orthotics can not be hot water or sterilized water soaking, can be washed with water. If you find that the aligner is damaged, please contact the doctor in time to repair or redo, to ensure that the orthodontic treatment is carried out smoothly.