Has your impression changed naturally with the corner of the mouth procedure?

My mouth looks sagging, so I am looking into procedures for the corners of my mouth to make a change.

I am also worried that the corners of my mouth might turn up too high or that my expression might look awkward when I smile after the procedure.

For those who have received the treatment, I am curious whether the change was subtle enough to naturally soften one's appearance, or if the transformation was significant enough for those around you to notice immediately.
Have you ever felt awkward with your mouth shape when smiling or felt uncomfortable while eating?

Please tell me how satisfied you were with the procedure and what points I should definitely check if I want natural-looking results.