What term describes a person who has lost all their teeth?

The term that describes a person who has lost all their teeth is "edentulous." This term comes from the Latin roots where "e" signifies "without" and "denture" refers to teeth. Therefore, an edentulous individual has no natural teeth remaining in their mouth.

In contrast, a person described as partially edentulous still has some natural teeth present. "Maloccluded" refers to a misalignment of the teeth when the jaws are closed, which is unrelated to the number of teeth present. "Congenitally missing" describes a situation where teeth are absent from birth, but it doesn’t indicate the complete loss of all teeth that has occurred after development. Hence, edentulous is the most accurate term for someone who has lost all their teeth.