Dental Whitening Click-Pens can be very effective if using a high-powered, high-penetration formulation. These Pens are great for those who dislike wearing trays or are on the go. You can use a Dental Whitening Click-Pen anytime, anywhere.  It’s easy and effective, but will take a bit longer than a traditional tray system. In the end, you can get almost the same results as a traditional tray-based system.