Dentures are removable appliances that replace missing teeth and surrounding tissues. They can improve your smile, restore your ability to eat and speak clearly, and boost your confidence. These replace all of your teeth in either your upper or lower jaw, or both. They fit snugly over your gums and stay in place through suction. There are 2 types of Dentures: Complete Dentures: These replace all of your teeth in either your upper or lower jaw, or both. They fit snugly over your gums and stay in place through suction. Partial Dentures: These are used when you still have some natural teeth remaining. They fill in the gaps and are typically held in place by clasps that attach to your natural teeth.