The length of orthodontic retainers is generally 1-2 years, but the exact length of wear should be determined by the degree of malocclusion, periodontal condition, age and other factors. Since teeth always have a tendency to “revert to their original shape” after orthodontic treatment, it is recommended to wear retainers for a long period of time, not limited to 2 years, if you want to keep the effect of orthodontic treatment. Retainers are custom-made devices, usually made of metal wire or clear plastic, that hold teeth in place after orthodontic surgery or other orthodontic treatment. By keeping the teeth in their new position for a period of time with a retainer, the surrounding periodontal fibers are allowed to adapt to changes in the bone, which can help reduce shifting of tooth position after completion of orthodontic treatment. For pediatric patients with good periodontal health, retainers are typically worn for about 1 year. For adult patients, they are worn for anywhere from 1.5 to 2 years. However, patients with severe periodontitis and root defects may need to wear a retainer for a long time or for life after treatment. It should be noted that during the use of the retainer, it should be worn without interruption and daily cleaning and disinfection should be paid attention to in order to avoid the occurrence of other oral diseases due to inadequate cleaning.