Retainers are used after orthodontics to do exactly what the name implies, they retain the progress you made. The last appliance you receive from Invisalign is your retainer, a clear custom-fit tray that will keep your smile straight for years to come. While some patients may need to wear their retainer more often, many just wear it at night to keep their teeth from slipping back. Wearing your retainer faithfully is your guarantee to keep your bite and smile at its best. The length of post-orthodontic treatment time and type of retainer can only be determined by a consultation with the dentists at the Marconi Dental Group in Carmichael.