Dentures are removable appliances that replace missing teeth. There are two main types: partial dentures which replace one or a few missing teeth, and complete dentures which replace all teeth in the upper or lower jaw. Complete dentures can be immediate, inserted on the same day as tooth removal, or conventional, inserted after healing. Dentures improve appearance, speech, and ability to eat, but may feel strange at first and require adjustments. Daily cleaning is important to remove plaque and maintain oral health.