I. Precautions Orthodontic aligners are bonded to the teeth by adhesive, wrong eating habits will cause frequent loss or damage of aligners, re-bonding bands or brackets fall off will increase the cost of treatment and the number of follow-up visits this will cause abnormal tooth movement, loss of support resistance, prolong the course of orthodontic treatment, and even lead to orthodontic failure, which will bring unnecessary losses to patients. Please be sure to note: need to gnaw or knock things can not eat, such as melon seeds, peanuts, walnuts, sugar cane; apples, pears, peaches and other fruits should be cut into small pieces before eating; steak, chicken legs, crabs, etc. must be cut with a knife or torn by hand into small pieces of meat or shelled before eating, can not be directly gnawed or torn with teeth; not rotten beef and other multi-fiber food can not eat; can not directly eat things with a core such as plums, prunes, cinnamon, dates, etc. You should separate the meat from the nucleus before eating; you can’t eat too sticky food, such as fudge, chewing gum and other kinds of sugar and glutinous rice products. Second, keep the oral cavity clean orthodontic treatment due to brackets, wires, rubber bands and other orthodontic devices affect the self-cleaning of teeth, so patients are required to brush their teeth carefully in the morning and evening and after each meal to thoroughly remove the soft scale and food residues on the tooth surface. Brushing method: vertical brushing. The horizontal brush will brush off the brackets and damage the teeth; the action should be gentle and slow, 3 to 5 minutes each time; every side of the teeth should be brushed, especially the rice, vegetables and other food stuck between the teeth behind the wire. If it is not easy to brush off, use a toothpick to gently pick in the vertical direction, but do not break the brackets or wires; use a small-headed soft-bristled children’s toothbrush; if you do not eat at home, please bring your toothbrush with you. If you can’t keep your mouth clean, it will cause tooth decalcification (commonly known as “yellow teeth”), caries (commonly known as “worm teeth”), gum redness and bleeding, and even periodontitis, which will affect the patient’s oral health and prevent the orthodontic treatment from going smoothly. Third, remind 1, the first wear orthodontic appliance and every time after the review and force, the oral mucosa may be worn, teeth may appear mild reactive discomfort or pain, generally last 2-3 days to reduce or disappear, if the pain continues for 4-6 days does not reduce or even aggravate, please contact the doctor in time to check. 2. If you find that the ring or bracket is loose or the arch wire is broken, you should contact the doctor in time for a checkup. Do not move or adjust the wires on the aligners by yourself to prevent loosening and necrosis of the teeth, which will affect the treatment.