For those of you who haven't already been swayed by toothpaste brands urging you to work on the whiteness of your pearly whites, then this Crest 'Pretty Girl' commercial may do the trick. Promoting Proctor & Gamble's Crest 3D White brand, the spot is part of a funny social media campaign that demonstrates why anyone would want to avoid yellow teeth.

Rolled out on the brand's YouTube channel and Facebook page, the Crest 'Pretty Girl' spot is the first ad in the campaign (of which there are six), and it shows a pretty young blonde walking into a party. Everyone turns to look at her and men gaze at her adoringly -- that is, until she smiles. When she does, a row of stained yellow teeth is shown, and the people around her are shocked. One guy even snaps a photo! Stay tuned for more commercials from the latest Crest campaign.