Buck teeth are so called because the appearance of protruding upper teeth resembles the prominent teeth of a buck, which is a male rabbit.
The term "buck teeth" is used to describe a malocclusion where the upper teeth significantly overlap the lower teeth. The resemblance to the prominent incisors of a buck rabbit (a male rabbit) is the primary reason for this descriptive name. Just as a buck rabbit's teeth are noticeable and protrude forward, so do buck teeth in humans. The term focuses on this visual similarity for easy understanding.
