Teeth whitening pens are must buy

I had this yellow teeth issue since i was a kid. I used so may stuffs but the shade was still yellowish. i found this pen online and order after looking at some reviews. I was not that convinced but it was fine to try. The pen contains gel in it. Well when i applied for the first time, it doesn't give too much whitening, The shade was still yellowish, However, the instructions said, it will take two days. And i used it according to that manual, S o after two days, my teeth shade got improved, The yellowish shade was not visible, I still thought i need to try one more time . so I read the instructions again and this time it did work
its really effective and i find it good, i can carry it with myself for important events and functions.