The main component of the face slimming injection is botulinum toxin, which mainly interferes with and inhibits the conduction of nerves, blocks the connection between nerves and muscles, makes the bite muscle atrophy smaller, and achieves the purpose of slimming the face. The correct injection of facial slimming injection will not have side effects, but if the injection is not appropriate, there will be complications. Botulinum toxin is blocking the signal transmission between the nerve muscles, and if it blocks the nerve muscle transmission that should not be blocked, it will create problems. If the injector does not accurately grasp the injection volume and injection site, the injection conduction to the cheek will result in a sunken cheek, and if the conduction to the neck, there may be difficulty in swallowing, etc., but these will disappear on their own as the effect of the drug wears off. At present, the only two types of botulinum toxin allowed to be used in China are the domestic Lanzhou Hengli and the American BOTOX. When choosing the brand of injection, we must pay attention to the selection of regular injection products. In order to prevent us from adverse complications in the injection or after the injection, in the choice of face slimming injection, must go to the regular plastic surgery institutions, in the operation of professional doctors to inject, to protect the injection effect and surgical safety.