Orthodontic treatment is orthodontic treatment for misshapen jaws. Orthodontic treatment is generally not harmful. It is a treatment method for the disease, there can only be some attention to matters not done or complications that occur. 1, if you do not pay attention to oral hygiene during orthodontic treatment, it will cause gingivitis and periodontitis. Periodontitis will lead to the atrophy of gums, causing the formation of black triangle between teeth, which affects the beauty, and also causes the embedding of food, which will aggravate periodontitis. So during the orthodontic treatment, you must keep good oral hygiene, brush your teeth carefully, and also cooperate with the use of dental floss, interdental brush and flosser to control the plaque, so that you can prevent the occurrence of the black triangle between the teeth. 2, during the orthodontic treatment poor oral hygiene, also can cause dental caries class disease. Because, during orthodontic treatment, you have to wear braces and after that, you have to wear a retention period, so it is very inconvenient to clean your teeth, and it is easy to cause caries. Orthodontic treatment is generally harmless, but we must pay attention to oral hygiene during orthodontic treatment so as to prevent periodontal and dental problems from occurring.