牙外傷是指外力(跌倒撞擊交通事故等)對牙齒牙周組織英語Periodontium牙齦牙周膜英語Periodontal fiber牙槽骨)以及附近的軟組織如唇、舌等造成的創傷。兒童更易發生牙外傷。[1][2][3]

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