I use this twice a day after I brush my teeth in the morning at night. I can actually tell the difference in the color of my teeth with this product if I keep up my routine of using it! I've searched forever for a cruelty free whitening option that actually works, and I've finally found it! I'll never look elsewhere.
I am extremely pleased with how well these pens work. I purchased both kinds and have been using them the way they recommend with peroxide pen morning and night and peroxide free in between. My teeth are whiter and shiny and look great! Zero sensitivity zero pain.
While I love all of the Dr. Brite products, I really LOVE this whitening pen. I saw some results by the second use and I was afraid it was going to be too strong for my sensitive teeth and it isn't. I plan to keep one of these pens available all the time.