Face-lifting needle, that is, botulinum toxin A injection, mainly acts on muscle tissue and is called face-lifting needle because it is often used to solve masseter hypertrophy. Face-lifting needle face-lifting is essentially to treat masseter hypertrophy with botulinum toxin injection. Women are beautiful in oval shape, and often need plastic surgery because of the hypertrophy of mandibular angle. The experience of botulinum toxin A in treating bilateral masseter hypertrophy is considered as a revolutionary new method. Botulinum toxin injection can reduce occlusal atrophy by denervation and make the treatment more thorough.