Say what you will about the selfie fad, but celebrities have the art of snapping a perfect shot down to a science. While some stars hire an “Insta-assistant” to capture their most-flattering angle, Elizabeth Banks prefers to take matters into her own hands. So, we asked her to share her secrets for capturing a glamorous picture every time—#NoFilter required.

“Keep your chin up, and always stand in good light– finding some good light is my number-one thing,” she tells InStyle.com. “I’m constantly turning toward windows to take a selfie.” In addition to looking fabulous, your selfie can also do amazing things for children around the country! Banks has teamed up with Listerine to challenge everyone to take the 21-Day Challenge, during which she hopes her fans will commit to brushing, flossing and rinsing with Listerine twice a day for the next 21 days. If you post a “Swish Selfie” to the brand’s Facebook page, Listerine will donate $5.00 per post to Oral Health America’s Smiles Across America program.

The initiative aims to provide services to children who do not have access to regular dental care. “I was pretty happy with my Swish Selfie, actually,” Banks adds. “Listerine donated $21,000 toward the cause when I uploaded it, so that was some of the easiest money I’ve ever donated!” Head over to Listerine’s Facebook Page for more information, find some great lighting, and snap your selfie now!

Never take a bad picture again by using these tips in our gallery!