Removable appliances in orthodontic treatment are devices that patients can take in and out of the mouth to help correct minor tooth movements, guide jaw growth, or maintain results after fixed braces. Common types include retainers, functional appliances, and simple plates with springs or screws. These appliances are typically made of acrylic bases with metal components that apply gentle, controlled forces to move teeth or influence jaw position. They are often used for early interceptive treatment in children, to correct habits such as thumb sucking, or to make small adjustments before or after comprehensive orthodontics. Because they can be removed for eating and cleaning, removable appliances offer good comfort and oral hygiene. However, their effectiveness depends heavily on patient compliance, as inconsistent wear can slow or limit results. Overall, removable appliances provide a versatile, noninvasive option for achieving targeted orthodontic corrections and supporting long-term alignment.