Many patients are worried that orthodontic treatment will make the teeth loose, reduce the service life of the teeth, in fact, orthodontic treatment is a kind of teeth in the physiological range of movement, in addition to a very small number of patients with specific physical characteristics will be caused by the treatment of obvious root resorption, will not have a significant impact on dental health, teeth in the process of the treatment of the temporary loosening is inevitable and normal, the completion of the treatment will disappear naturally. But orthodontic treatment aggravates the burden on the teeth, and due to the presence of orthodontic attachments to increase the difficulty of oral cleaning, if oral hygiene maintenance is unfavorable, will promote and aggravate gingivitis to periodontitis, secondary dental caries, so orthodontic treatment of oral hygiene maintenance is crucial, it affects the effect of the treatment and dental health, adults and patients who have suffered from periodontal disease is particularly important, if the oral hygiene maintenance is unfavorable, it is inevitable to the If oral hygiene is not well maintained, it will inevitably cause irreversible effects on dental health. Meng Qingfang, Orthodontic Department, Urumqi Stomatology Hospital There are also some patients who hesitate because of orthodontic extractions, worrying that the reduction in the number of teeth will have any adverse effects or the extraction gap can not be closed. In fact, a lot of malocclusion is because the jawbone can not accommodate these existing teeth will occur, tooth extraction is to create a gap to align the teeth, adjust the bite relationship, is to achieve aesthetic and functional perfection, is conducive to oral health, and will not be left gap.