PAP-X strips work by oxidising stain molecules on the tooth surface, the same principle as traditional whitening but without the peroxide. p80 Strips take a different approach entirely, built around the same colour-correcting technology used across the p80 range, delivered in a strip format for longer, more even contact time than the serum or foam. If you have used PAP-X before and want to try a different mechanism, or you are drawn to the colour-correction concept but want a set-and-forget application, this is that option.