Facial slimming injections usually take effect about 7 days after injection, and the effect is most obvious about 1 month. A few individuals have a small range of time difference. Botulinum toxin is injected symmetrically into the part of bilateral biting muscle hypertrophy to inhibit part of the biting muscle contraction, and use the principle of “use in, use out” to cause the inhibited biting muscle atrophy, so as to achieve the effect of face slimming. After the injection, avoid rubbing the injection site, avoid using too hot water to wash your face, so as not to cause drug diffusion, drug absorption, and affect the final effect of face slimming. Face slimming injection is not a once-and-for-all way of face slimming, usually an injection can be maintained for about 5-7 months, if you still want to achieve long-term face slimming effect, you need to go to the regular medical institutions on time to repeat the injection.