The actor you're looking for is Steve Jasgur.
The commercial this question here is referring to is Listerine - "Morning".

I work at an ad agency in Detroit and a couple of years ago he submitted a headshot of himself to my boss for our talent dept. He's terribly good looking in person and my boss and I refer to him as "ListerSteve" because we immediately recognized him from the Listerine commercials. Unfortunately our ad agency hasn't used him in anything! Anyway, here's a little bit of what I found out about him:
"Steve Jasgur
Co-producer/Actor - The 3 Little Wolfs

Steve Jasgur attended the University of Michigan where his studies focused on film and television production. After graduation, he left for New York City to pursue a life in front of the cameras. His performance credits have included appearances on the daytime dramas, “All My Children” and “The City” as well as several independent films. Additionally, Steve has appeared in over 30 television commercials, most notably of late, as the “30 seconds - you can do it” Listerine Guy. Presently residing in the Detroit, Michigan area, he owns and manages an entertainment company that provides DJ's and performers for bar and bat mitzvah celebrations, and teaches ballroom dancing to preteen children, reaching over 400 students annually."