First, "face-slimming injections" is a colloquial term; the actual substance injected for facial slimming is botulinum toxin. While botulinum toxin is highly toxic, the form used in medical aesthetics has been processed and diluted. Current application doses are merely one percent of the maximum safe dose, posing no toxic side effects to the human body.
Botox injections work by disrupting nerve signals to the masseter muscles, causing them to atrophy and shrink. This leads to a more thorough treatment, effectively reducing the size of a large face.
Botox has no significant side effects and offers more advantages than traditional surgical methods. Potential local adverse reactions mainly include excessive weakness in the masseter muscles and symptoms caused by Botox diffusion into adjacent muscle tissues. These effects typically resolve on their own within a few weeks.
Typically, masseter muscle atrophy and facial contour changes become noticeable one month after injection. The effects generally last between six months and one year. Repeat injections can extend duration as efficacy diminishes, without concern for toxin accumulation in the body.