Jaw defect is a common disease in the mouth medicine, which could be caused by tumor, congenital abnormality, trauma and serious firearm damage.

在临床口腔医学中，颌骨缺损是最常见的疾病之一，它由肿瘤、先天发育畸形、外伤等引起。

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She and her colleagues knew they were on to something, putting together a research letter called " Firearm Injuries of Children and Adolescents in 2 Colorado Trauma Centers: 2000-2008, " which was published Tuesday in the Journal of the American Medical Association.

CNN: Kids and guns: 'These are not isolated tragedies'