Clostridium botulinum is a toxin that causes flaccid paralysis by blocking motor nerve terminals. By paralyzing the nerves on a certain part of the face, the muscles in that area will not contract and give rise to wrinkles.
肉毒桿菌是一種毒素，利用它對神經具親和性，會麻痺神經的特性，來使臉部部分神經暫時麻痺，那部分的肌肉也就不會收縮、形成皺紋。