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There is nonetheless a significant drawback with whitening strips. The whitening strips only whiten the teeth they are in direct contact with. Serum Anti Aging is a interesting resource for supplementary resources concerning why to see about it. They only whiten the front teeth. Some people find that the strips are not lengthy sufficient to cover all the teeth they show when they smile. Whitening strips normally cover at least the six center teeth, eyetooth to eyetooth. A tray based method will provide whitener to all the teeth equally.