A retainer is a dental device that helps keep your teeth in their new positions after braces are removed. It is usually made of plastic and wire, fitting snugly over your teeth. Wearing a retainer is important because it prevents your teeth from shifting back to their original places, ensuring that the results of your orthodontic treatment last. There are different types of retainers, including Hawley retainers, which are removable and adjustable, and clear plastic retainers, which are nearly invisible. Your orthodontist will recommend the best type for you based on your specific needs and treatment plan. Regular use of a retainer is key to maintaining a beautiful smile.