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The retainer is a measure taken to consolidate the curative effect after the orthodontic treatment of dental and jaw deformity and keep the teeth in the ideal aesthetic and functional position, which is called retention. And what is worn at this time is called a retainer. After correcting the teeth and removing the appliance, because the teeth are not stable in the new position, it is often necessary to wear a retainer to maintain the new position of the teeth on the alveolar bone and wait for the reconstruction of the alveolar bone.