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I was skeptical the gel would actually do anything, but after a week of nightly applications I can already see the difference on my coffee-stained front teeth. The pen is super convenient for quick touch-ups during the day, and it doesn't taste awful like other kits I've tried.

After two weeks of using the pen after each gel session, my coffee stains are noticeably fainter and the shade has held steady. The pen's slim tip makes it easy to target the front teeth without making a mess.

The whitening pen is my favorite part—it’s so easy to swipe on after coffee and keeps my teeth from yellowing again. I noticed the gel lifting stains around my third use, and the whole kit’s been a solid morning routine addition.