Who's the brunette in the new crest white strips advance seal commercial?

Bridgette Wilson-Sampras

That’s not Bridgette Wilson in the commercial.

Must be a different commercial.

No it wasn’t a different commercial. Bridgette Wilson doesn’t do TV commercials.
Also Bridgette Wilson is blond.

I’m too lazy to look for the source again.

The OP can look at the photo, and will know in a moment whether I am right or wrong. That’s why I included the image link.

The acress in the Sept 2009 commercial bears a resemblance to Lucy Segura, who was “Lucy in LA” on YouTube in 2007–2008. One can’t be sure, because the actress in the commercial appears to have a slightly slimmer face than Lucy Segura, but the resemblance is definitely there.

“Lucy in LA” disappeared from YouTube over a year ago and has not been heard from since, not even on Lucy Segura’s own web page.

Oops! It’s “Laura” Segura.

i think the girl you are trying to ID is natalia cigliuti