The commercial in question is set in a museum, where the tour guide is
showing his group the Mona Lisa.  He has blond hair and, in my
opionion, looks and sounds exactly like the famous film actor Roddy
McDowell!  What is the name of this TV commercial actor?
Thanks in advance.

Can't tie him to the product but I have seen the commercial and he
looks and sounds like Daniel Gerroll.  Total WAG on my part.  I'd wait
for backup.
http://www.imdb.com/name/nm0314776/

Thanks for the comment and the link to Daniel Gerroll, whom I
recognize from television and unfortunately isn't the one.
The actor I'm looking for is younger...30-ish, I would guess.  I
should have mentioned this originally.

Is this the actor?

http://www.mortalwombat.com/Special/actor3.jpg

You may find something here
http://search.starware.com/search.php?product=gsearch&tmpl=1B&qry=Crest%20Whitestrips%20actor

Kind regards

Ross

Thanks all, but no dice.  I'll add one more comment, then I fully
intend to shut up.  I've never seen this actor before anywhere, much
less in a credited role.  I wouldn't be so diligent, but for the fact
that the resemblance to the late McDowell is driving me crazy.
This is my first question, here.  Thanks again for the help.

Sad to say, but Roddy McDowell died in 2002.  Also, the actor in the
ad doesn't look familiar to me.