Botulinum toxin does not work like a filler. Nothing is being plumped, so there is nothing to see the moment you leave. What happens instead is that the nerve signal to the muscle is gradually switched off, and that takes days.
You will have small raised bumps where the injections went in, a bit like tiny insect bites. They usually flatten within about an hour. Some redness and occasional small bruises are normal, particularly if you bruise easily.
Your face will move exactly as it did before. That is expected.
Most people see no change at all here. If you are watching the mirror closely and feeling disappointed, this is the stage where that happens. It is far too early.
This is the median point at which published studies report the first visible softening — about half of people notice it by now, and about half later. It tends to feel like a slight heaviness or a sense that the muscle will not fully engage when you frown.
It is uneven at this point. One side commonly comes on before the other. That is not a sign the result will be uneven.
The bulk of the effect appears across the first week. Lines look softer at rest, and the movement that created them weakens.
Lines that were etched into the skin from years of movement will still be visible. Botulinum toxin stops the movement making them deeper; it does not iron out a crease that is already set in the skin.
By two weeks you are looking at the real outcome, and this is the standard point to assess it.
If one side sits higher than the other, or one area moves more than you wanted, this is when a few extra units fix it. Worth knowing: the two-week check is standard practice rather than something a trial established. It sits inside the two-to-four week window in which peak effect is documented, and it is what most injectors use.
Ask before you book whether a two-week review is included. Many clinics include it; some charge for the extra units.
Movement returns gradually. Most people notice it coming back somewhere in the third or fourth month, and the FDA label describes the effect lasting up to four months.
It does not stop suddenly. Lines reappear on movement first, then at rest.
Repeat treatment should not be given more often than every three months.
Go to an emergency department or call 911. Do not wait for a call back. These are rare, but they are the symptoms named in the FDA boxed warning that every botulinum toxin product carries, deaths have been reported, and they can begin hours or even weeks after treatment.
If a vision change is sudden or severe, seek urgent care rather than waiting.