Dentitox Pro This pen will take just a second to apply. The manufacturer suggests not eating or even drinking anything after about one hour of its application so as to make the teeth whitening process more effective. How does  Dentitox Pro  work?  Dentitox Pro  teeth whitening pen actually works because of its effective composition. The main ingredient used in this pen is actually peroxide. When peroxide gets contacted with your teeth, it starts breaking down and thus it allows the oxygen to enter deeply into the enamel of your teeth and then your teeth start lightening. Besides peroxide, the pen contains many other important ingredients and all these ingredients work together to fight with the stains that are stuck to your teeth. What are the pros?