The damage to the teeth should be distinguished into 2 parts, one is the damage to the hard tissues of the teeth and the other is the damage to the periodontium. Orthodontics is a rigorous medicine, the primary goal is health, the regular operation of the regular doctor will not harm the dentition and periodontium. 1, the damage to the hard tissues of the teeth: usually caused by caries and trauma Chronic defects in the teeth are usually caused by tooth decay, starting from the enamel, little by little, deep into the pulp, root tip, the teeth will first form chalky plaques, and after that, there will be black and brown spots or lines, and the hard tissues of the teeth will be eroded little by little. Orthodontic correction, especially the use of fixed bracket orthodontic patients, during the treatment period if the teeth demineralization, mainly due to the brushing is not thorough, because The bracket itself is metal or ceramic, monocrystalline material, does not have the conditions of erosion of the tooth surface; Bonding bracket used in adhesive is orthodontics special adhesive, verified in many cases, also does not hurt the tooth surface; Then, only the bracket and archwire to cover the tooth surface, So, only the brackets and archwires cover the tooth surface, the gap between the teeth, the brushing difficulty increases this one has changed significantly compared to the pre-orthodontic period, so the problem of demineralization of the teeth during orthodontic white spots, and brushing is not thoroughly related. The solution to this problem is also very simple, we just need to cooperate with the flosser, interdental brush, dental floss these aids, serious brushing, can be completely avoided. As for trauma, the strength of orthodontic treatment is generally not reached, and usually there is no such accident. 2, the damage to periodontal tissues: usually caused by gingival inflammation The pathogenesis of periodontal inflammation is complicated, but plaque retention is its direct cause. Fixed orthodontic appliances will affect the self-cleaning of teeth and hinder daily cleaning. If patients can’t maintain oral hygiene, gum inflammation will occur, which is manifested as red, swollen and bleeding gums. However, there is no need to worry too much, in clinical experience, in most cases, this gum inflammation is temporary, and the inflammation will gradually disappear after changing the brushing method or ending the orthodontic treatment. And it mostly occurs in teenage patients, with a relatively low prevalence in adults. Therefore, orthodontic treatment will not directly harm the teeth and periodontal tissues, as long as you can brush your teeth carefully, both of the above situations can be avoided, and even if they occur, they will recover after the end of orthodontic treatment.