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fracture middle third of face oral and maxillofacial surgery omfs surgery fracture tooth lost from the socket ellis class5 pedodontics ²¹±¹³Ü±ô²õ¾±Ã³²Ô dental avulsion dental foul smell breath malodor oral malodor bad breath bruxism thumb sucking lip biting posture mouth breathing toungue thursting nail biting abnormal pressure habits habits childhood habits oral habits