Hismile whitening strips have mixed reviews. Many users find them easy to use, with visible whitening effects and no sensitivity, praising how the strips stick well and can whiten teeth within about 30 minutes. However, some users report no results even after consistent use, and there are mentions of issues like uneven whitening (white spots) and the product's short shelf life affecting effectiveness. The product claims to be pain-free with no hydrogen peroxide but some sensitivity and mild discomfort were reported by a few testers. Overall, the strips seem to work well for many people but results are inconsistent, and some users remain skeptical about the whitening claims, especially regarding instant whitening. Customer service is noted as responsive in some cases but there are complaints about shipping and communication as well.
