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Toxins work on movement
Botulinum toxin medicines reduce how much certain muscles tighten. That can make some expression lines less noticeable. The cosmetic effect is temporary.
Approval has limits, though. One medicine's label doesn't speak for every toxin or every use. The FDA label for one cosmetic toxin sets out particular uses in adults, alongside risks such as eyelid or brow droop.
Ask which medicine is being proposed and what its label says about that use. “Just a little smoothing” leaves a lot unexplained. The toxin chapter puts the approved uses and warnings together.