Dentures can replace lost or removed natural teeth. A denture is made of artificial teeth fitted into a base that is crafted to look just like your natural gums. An upper denture features a plate, which covers the roof of your mouth, while the lower denture is horseshoe-shaped and rests securely on the gum and bone tissues. They can be a “full” or “partial” denture, either replacing all teeth on the top or bottom of your mouth, or just a few that are missing.