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Background Mental nerve (MN) injuries are reported during transoral endoscopic thyroidectomy vestibular approach. Effect of trocar insertion and position on MN are examined in the present study. Materials and methods Ten millimeter incision was made at the center of the lower lip oral vestibule. Two 5 mm lateral incisions of the lower lip oral vestibule were made at the junction between the incisor and the canine. These 2 lateral incisions were high, just below the edge of lower lip. Nine pigs (18 MN) were randomly divided into 3 groups