Steel Bite Pro pain then this pen is really going to work for you. 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 Steel Bite Pro work? Steel Bite 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? Although Steel Bite Pro is a simple and small device with very simple mechanism but it contains huge benefits.