1, orthodontic period can not use teeth to bite hard objects, such as nuts, ribs, crabs, etc.; eat fruit to avoid using the front teeth to bite directly, it is best to cut into small pieces to chew with the back teeth to avoid brackets off. 2, carry toothpaste, toothbrush (brush head should be small, bristles should be medium hard), must brush your teeth after eating, rinse your mouth after drinking, master the correct method of brushing teeth, keep teeth and gums healthy. Poor oral hygiene will cause tooth surface demineralization and even caries, and the tooth surface will be unattractive after removing the aligner. 3, each time the teeth will be swollen and painful after the follow-up, biting weakness for a few days, is a normal phenomenon, during this period should eat softer food. 4.If the brackets fall off or the wires are deformed during the orthodontic treatment, you should contact the doctor in charge in time and make a follow-up appointment. Poor oral hygiene maintenance leads to tooth demineralization (yellow and white) Long-term poor oral hygiene leads to inflammation and gum growth in the lower front teeth area