1, why should we pay attention to oral hygiene maintenance during orthodontic treatment? (1) Due to the interference of the brackets, food residues are not easy to clean and easily stored on the teeth, so that plaque accumulation growth. (2) Long-term accumulation of plaque is likely to cause gingivitis, periodontitis, resulting in redness and swelling of teeth, easy to bleed. (3) Plaque and soft scale around the brackets and neck of teeth for a long time will easily cause demineralization of teeth and affect the beauty of teeth. 2.How to maintain oral hygiene? (1) Brush your teeth diligently. Every morning and evening, after meals should be carefully brushed, time about 3 minutes, the strength should be appropriate, the best use of orthodontic special toothbrush. (2) Rinse your mouth more often. When you cannot brush your teeth immediately after drinking or eating, you should rinse your mouth in time. In case of tooth inflammation, rinse your mouth with special mouthwash under the guidance of a doctor. (3) Dental cleaning. Regular (3-6 months) dental cleaning is good for maintaining the health of periodontal tissues. 3.What else should I pay attention to? (1) Should avoid eating hard things, such as nuts, crabs, ribs, etc. (2) Biting and gnawing should be avoided, such as gnawing apples with a big mouth. (3) Should avoid eating sticky food, to prevent food sticking to the aligner is not easy to clean, but also may stick down the orthodontic attachment. (4) When wearing a movable orthotic or retainer, it should be cleaned daily and kept in cool water when not in use.