Getting a megawatt smile doesn’t exactly come cheap. Luckily, beauty guru Drew Barrymore, who regularly shares the contents of her makeup bag, is here to help with a teeth-whitening hack that will cost you less than $20.

Say hello to the Colgate Optic White Whitening Pen ($13), with bonus toothbrush to boot! As the mommy of two revealed on Instagram, the pen helps her stay ahead of stains she says she gets from tons of tea-drinking.

“I finally found something that helps me,” she wrote. “I drink ice tea all day long. It’s my life. But, there is a reason they call it ‘tea-stained,’ because it does. Then my teeth are super sensitive, so most brighteners and bleachers are out of the question! Not to mention, who has time to go sit in chairs and have your teeth whitened? So I found this because my friend swore by it, and I’m telling you! I love it.”

The Miss You Already actress said it also helps her in the lipstick department. “It really works and I feel so much better about my teeth,” she wrote. “Especially when you wear certain lipstick colors (reds etc) that can really bring out the truth of your teeth. So, grab this and do it at home. Worked for me! #smile.”

It was one in a long line of beauty recommendations the producer made for #beautyjunkieweek, but lest you think she was paid, think again: As Barrymore herself said in a closing shot of herself surrounded by all the makeup products a girl could ever dream of, “I haven’t been paid or influenced to share anything in these posts. They’re just things I love or have discovered and wanted to share.”

Other recent top picks include Glamglow’s Supermud Clearing Treatment ($22); Jayjun Cosmetic Baby Pure Shining Mask ($16), which Barrymore called the “gold standard of face masks;” FLOWER Beauty Sunshine Perfume ($20), which is her “summer go-to;” and Malibu Professional Crystal Gels ($49), recommended to our girl by none other than celeb hairstylist Tracey Cunningham.

Check them out in full on her Instagram page.

Will you try Drew’s budget-friendly hack? Tell us how it goes @BritandCo.

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(h/t POPSUGAR; photos via Carlos Alvarez/Getty)