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Zimba

Hydrogen peroxide whitening strips at a corner-store price. Your teeth don't know this was the cheap one.

Peroxide strips are one of the few cosmetic categories with randomised trials behind them: real, measurable shade change inside two weeks. Tooth sensitivity is the toll. Full stop. Zimba runs the same chemistry as the household name everybody already knows, for about a third of the money. Not a knockoff. Just better maths, the kind that makes trying it a no-brainer.