Does the subject want to ask "what is the thinnest thing in St. Boffice?" Face-lifting needle St. Boffice's face-lifting needle is a kind of face-lifting needle, which injects a bioactive substance (botulinum toxin A) into the masseter muscle, and gradually contracts the masseter muscle by inhibiting the transmission of acetylcholine transmitter at neuromuscular junction, thus playing the role of face-lifting.