There are two types of dentures: partial and complete (full).
A complete denture is used when the patient has no teeth. A partial denture is used when the patient has some teeth. A partial denture can be used in place of a bridge when surrounding teeth are not strong enough to hold a bridge, or when more than just a few teeth are missing.
Dentures are fully removable by the patient for cleaning. Both are made from taking an impression of your mouth. When requiring a complete denture, the Prosthodontist ensures, by using various procedures, that it fits properly, does not impede good speech and is aesthetically pleasing.