Retainers are essential orthodontic devices designed to preserve the alignment of teeth after braces have been removed. Typically crafted from plastic or acrylic, they are custom-fit to the patient's mouth for optimal comfort and effectiveness. Retainers come in two main types: removable and fixed. Their purpose is to apply gentle pressure to the teeth, which helps prevent them from reverting to their original positions. This role is crucial in the orthodontic treatment process, as retainers help to sustain the results achieved through braces or aligners. The duration for which a retainer should be worn can vary based on individual needs, but it is generally recommended that patients continue to wear a retainer indefinitely to maintain their new smile.