Which condition involves the lower jaw being too short, causing the lower incisors to strike behind the upper incisors?

Which condition involves the lower jaw being too short, causing the lower incisors to strike behind the upper incisors?

• A. Parrot Mouth
• B. Overbite
• C. Underbite
• D. Buck Jaw

Answer: (A)

When the upper jaw is effectively ahead or longer than the lower, the lower incisors end up sitting behind the upper incisors. This creates a beak-like bite that people describe as a parrot mouth. It’s a specific way an overbite can present, reflecting a jaw-size mismatch where the lower jaw is relatively shorter. In contrast, an underbite or buck jaw involves the lower jaw sticking out in front of the upper jaw, not behind the uppers. So the situation described fits parrot mouth because the lower teeth bite behind the upper teeth due to a shorter lower jaw.

When the upper jaw is effectively ahead or longer than the lower, the lower incisors end up sitting behind the upper incisors. This creates a beak-like bite that people describe as a parrot mouth. It’s a specific way an overbite can present, reflecting a jaw-size mismatch where the lower jaw is relatively shorter. In contrast, an underbite or buck jaw involves the lower jaw sticking out in front of the upper jaw, not behind the uppers. So the situation described fits parrot mouth because the lower teeth bite behind the upper teeth due to a shorter lower jaw.