If you have botulinum toxin injections to treat your gummy smile, then you can expect a quick (less than an hour) and pain-free procedure. You'll just feel a sharp scratch as the injections go in.
There may be some redness and swelling around injection points, but this will calm down after a few hours. Normal activity can resume immediately after treatment.
The full result of gummy smile reduction treatment usually takes two weeks to take effect and will last three to six months.