因为当人们俯卧的时候，下颚会比平时更加突出。
When people sleep on their front, their lower jaw is positioned further forward than normal.
下颚突出式咬和如果有两颗或两颗以上的上门牙无法与下门牙接触，属于失格。
An undershot bite in which two or more of the upper incisors lose contact with two or more of the lower incisors is a disqualification.
就连方形脸的人都能佩戴它们，因为“它们能突出眼睛的部位，并且圆形的底盘让下颚线条更柔和，”莫兰德说。
Even people with square faces can wear them, because "they place emphasis on the eyes and the rounded bottom softens the jawline", Morland told Cosmopolitan.
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