We are exposing the case of a 22 year-old patient presenting a wound of the right cheek, with a palsy of the right corner of the mouth. He has been sent to us 6 days after the trauma for secondary exploration. A section of the buccal branch of the right facial nerve with a 1cm gap has been brought out. We have bypassed the loss of substance with a collagen absorbable biological conduit. The 6-months clinical and electromyographic follow-up has shown a clear improvement of the function of the orbicularis oris, as well as its reinnervation by the buccal branch of the right facial nerve.