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The gel glides on smoothly and actually seems to sink into the enamel, and after a week of nightly use I can already see my coffee stains fading. The pen is handy for touch-ups mid-day, though I mostly rely on the gel for the heavy lifting. My teeth feel slick and clean every morning, which is a nic

Two weeks in and the pen is the real MVP — I keep it in my car and swipe it on after lunch, so the whitening actually sticks around instead of fading by Friday. The gel stung a tiny bit the first day but now it’s nothing, and my coffee stains are honestly barely visible anymore.

Used the gel every night for a week and my coffee stains are visibly lighter. The pen's a nice touch for midday touch-ups, though I mostly rely on the gel's enamel-pore action.