Photo credit: Spring Dew via Foter.com / CC BY. Patients may need post-orthodontic surgery, such as a fiberotomy or alternatively a gum lift, to prepare their teeth for retainer use and improve the gum line contours after the braces come off. Retainers Hawley retainers are the most common type of retainers. There are retainers for the top and bottom of the mouth. In order to prevent the teeth from moving back to their original position, retainers are worn once the treatment is complete. Retainers help…