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The gel really does penetrate deep—after a week of nightly use I can see the coffee stains fading from the cracks between my teeth, and the pen is perfect for touch-ups after lunch.

After my morning coffee I barely recognized my smile in the mirror, the gel really does penetrate and lift the stains instead of just covering them. The pen is a bonus, tiny enough to toss in my purse and it keeps everything bright between sessions.

The pen is perfect for touch-ups after lunch, and the gel actually worked on my coffee-stained front teeth within a few days. I'm still using the pen to keep new stains from forming, and so far so good.