Dentures - Why would we need them and what are the options? If poor oral health, an accident or even heredity diseases have left a patient with a few healthy teeth only, a dentist may suggest dentures to replace those healthy teeth with either a full or partial denture. Complete dentures, otherwise known as false teeth, are used when all of a patient's natural teeth are missing. Partial dentures consist of one or more false teeth, and are held in place by clasps that connect