I want to get fillers from a skilled doctor with good reviews.

My boyfriend filmed me smiling on video during a date recently, and I noticed that the corners of my mouth were sullen like a bulldog's, with deep vertical shadows. While I can just smooth out photos with a photo editing app, seeing those wrinkles swaying every time I spoke in the video really hit me hard. No matter how hard I tried using lifting bands and massagers, the sunken skin between the sagging skin wouldn't lift, so I decided to get fillers to add volume to the grooves around my mouth. Since the muscles around the mouth are used all day long, I'm trembling with worry about the filler clumping or feeling like hard beads. Please tell me the criteria for choosing a skilled doctor who can precisely fill in the sunken gaps without overdoing it, and how long the soreness lasts when making facial expressions after the procedure.