How long does the face-slimming injection last?
“Face-slimming injections” refer to botulinum toxin type A (Botox) injections, which primarily target muscle tissue. They are commonly used to treat masseter muscle hypertrophy and are thus colloquially termed “face-slimming injections.” So, how long do the effects of face-slimming injections last?

How Long Do Face-Slimming Injection Effects Last?
The effects of face-slimming injections typically last approximately 6 to 12 months. These injections contain botulinum toxin; however, its effect gradually diminishes over time, after which the masseter muscles may temporarily re-enlarge, necessitating repeat injections. Repeated treatments help stabilize and prolong the results. The active ingredient is botulinum toxin produced by *Clostridium botulinum*. Upon injection, it blocks neuromuscular signal transmission, thereby reducing masseter muscle bulk and improving associated symptoms of hypertrophy. It may also be used to address localized fat accumulation. Noticeable effects usually appear within 3–5 days post-injection, while visible facial contouring typically becomes apparent after about two to four weeks. With consistent, regular treatments, results tend to be more sustained. Face-slimming injections are a popular minimally invasive cosmetic procedure; most patients observe significant improvement within approximately one month. For optimal maintenance, injections are generally recommended every three months.

After receiving face-slimming injections, avoid hot baths and saunas for at least 24 hours, and refrain from visiting heavily polluted environments. For one week following treatment, avoid consuming hard, chewy, or spicy foods.
The above information addresses the duration of face-slimming injection effects. We hope this response is helpful to you.