A retainer is a custom-made oral appliance often used to maintain the alignment of your teeth after orthodontic treatment. If you have finished your orthodontic treatment, such as braces, our orthodontist may recommend a retainer to keep your smile properly aligned. As you age, your teeth tend to shift; the retainer ensures that your teeth remain in correct alignment for optimal oral health, functionality, and appearance. There are three main types of retainers available: