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Your whitening strips aren't whitening your teeth. They're staining them deeper. Stockton University put them under a microscope. One round destroyed 33% of the collagen scaffolding that holds enamel together. Once that structure cracks, stains stop sitting on the surface. They soak in. That's why your morning coffee stains faster than it did 5 years ago. Why the edges of your front teeth look translucent. Why cold drinks make you flinch. None of that is aging. It's a damage signal — and there are 7 of them. 👉 See the 7 signs your strips have been hiding →