Dentures are a removable replacement for missing teeth and surrounding tissues. Your teeth might be gone because of gum disease, tooth decay, or an injury. They are made of acrylic resin, sometimes combined with metal attachments. Complete dentures replace all the teeth. Partial dentures are considered when some natural teeth remain, and are retained by metal clasps attached to the natural teeth. There are three types of dentures: conventional, immediate and overdenture. A conventional denture is removable. It is inserted after several months once the remaining teeth are removed and the surrounding tissues have healed. An immediate denture is also removable. It is inserted the same day that the last of your teeth are removed. An overdenture is used when there are still some teeth remaining. This type of denture fits over the teeth, the remaining portions of teeth, or implants.