Philips Zoom Whitening Gel is a high-performance gel designed to give you a professional-grade whitening experience at home. The gel even contains ingredients like hydrogen peroxide that fight stain from coffee, wine, smoking, and aging. When you use this gel with custom trays it applies evenly, protects your teeth, and will provide a faster, and whiter result. The gel is low in viscosity, and therefore it will slowly lift discoloration, providing a noticeably whiter, brighter smile over time. Above all, it is gentle on enamel, made to limit sensitivity, and a safe, convenient way to get a brighter smile without the need for a dentist. Follow this link https://thewhitesmiles.com/shop/crest-whitening-strips-professional/