At Caraway Orthodontics, we’re proud to offer a number of high quality orthodontic treatments, including braces, Invisalign, and Invisalign Teen, that are guaranteed to give all those in and around Louisville and Erie, CO straight and healthy smiles. In order to maintain your new and improved smile though, it’s important to wear your retainer. Your retainer is a vital part of the process as it will keep your teeth from falling back into misalignment. However, sometimes patients will find that their retainer doesn’t fit anymore. This happens because of two main reasons.