Teeth whitening strips are thin, flexible pieces of plastic (polyethylene) that have been coated on one side with a thin film of hydrogen peroxide bleaching agent. As opposed to other at-home teeth whitening systems where a whitener is placed into a tray, in this case the strip itself is the delivery system for the whitener and the precise dosing of the teeth bleaching agent is administered by the manufacturer. Whitening strips are positioned across the user's teeth and then gently pressed into place so to create maximum contact between the whitener and each tooth being treated. Whitening strips kits contain two different shaped strips. Half of the kit's strips are designed to fit across the user's upper teeth and the other half are shaped so to fit across their lower teeth. Can deliver visible whitening results on good whitening candidates. Affordable and widely available.
