Bite muscle hypertrophy is one of the causes of wide lower face. One of the improvement methods is partial excision of the bite muscle, but it is not the ideal treatment because it is easy to bleed and may cause postoperative hematoma, and the muscle section is uneven and may have a bumpy wound. At present, the most ideal method of improvement is the bite muscle toxin injection, commonly known as face slimming injection. Personal injection experience and experience is: 1, multi-point injection (5 points per side), conducive to the spread of botulinum toxin; 2, different injection points apply different doses, conducive to the role of botulinum toxin on different parts, different thickness of the bite muscle; 3, the interval between the injection points should be moderate, in order to play the maximum range of botulinum toxin effect; 4, for bilateral bite muscle volume of different candidates, properly adjust the left and right sides of the botulinum toxin 5, facial anatomy must be well understood, especially the distribution of the bite muscle, so that Botox must be injected in the best part of the bite muscle, but also to avoid the possibility of depression under the zygomatic arch; 6, master the depth of injection, so that the drug is only injected into the muscle of the bite muscle and not into other parts of the expression muscle, to prevent other adverse consequences; 7, Botox Injections should not only work on the bite muscle, but also indirectly play a role in relaxing the broad neck muscle to prevent facial skin relaxation; 8, proper treatment cycle and detailed post-operative precautions for medical advice is an important guarantee to maintain the treatment effect. Since there is generally no way to undo the bite muscle toxin injection once some undesirable problems occur, and can only wait for six months to recover after the drug effect wears off, the choice of the injecting doctor must be careful on the basis of ensuring the authenticity of the drug. The botulinum toxin purchased from the right channels + qualified, trained professional plastic surgeons can only enable candidates to obtain the real ideal face slimming effect.