Has anyone received botox injections at the corners of their mouth? How was it?

Maybe because there aren't many things to laugh about haha I feel my smile lines getting deeper and deeper.
Additionally, the strength of the right corner of the mouth is relatively weak, so I smile awkwardly when I smile.
I heard that more people are getting botox for the corners of their mouths than I expected.
Is there anyone who has tested it out if it doesn't fail?

I'm curious about how severe the side effects are and what the appropriate frequency should be, haha.