7 February 2013 10:20 AM, PST | Entertainment Tonight | See recent Entertainment Tonight news »

For Ginnifer Goodwin, joining the cast of Once Upon A Time has resulted in more happy endings than she could have dreamed of. Not only is the fantastic fantasy series one of ABC's biggest hits, but the show's popularity has allowed Goodwin to use her celebrity status to bring attention to worthy causes. Like she did on February 5 by helping Listerine kick off their 21 Day Challenge!

To help Americans develop better oral hygiene, and improve access to dental care for children in need, Listerine donated $21,000 after Goodwin's "swish," and will continue to donate every time someone signs up for the challenge on Facebook!

ETonline caught up with Goodwin to talk about this mighty cause and this even mightier season of Once Upon A Time (particularly what you can expect from the introduction of Snow White's mother)!

ETonline: How'd you come to partner with Listerine?

Ginnifer Goodwin: I made some friends at Listerine and they taught me a little »

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