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An underbite occurs when the lower teeth extend beyond the upper teeth. This misalignment can result in facial imbalance, causing the lower lip to appear fuller, and can lead to various functional issues. In certain cases, it may not seem severe aesthetically, as seen from profile pictures where the lower jaw's position is obscured.
However, when examining dental relationships, particularly with an X-ray, underbites reveal a clear disparity where the lower jaw is positioned too far forward compared to the upper jaw. This misalignment can lead to crowding, crossbites, and undue stress on the jaw muscles over time.