Smilebriter 120 Day Supply comes with four teeth whitening pens, totaling an impressive 8 milliliters of teeth whitening gel formula: enough to create the whitest of smiles. Smilebriter teeth whitening pens are replacing the old, inconvenient whitening strips of the past. With 44 percent Carbamide Peroxide (the equivalent to 17 percent Hydrogen Peroxide) the formula creates an oxidizing effect on your teeth, which is the scientific process behind teeth whitening. Dental professionals recommend Smilebriter not only because it is one of the strongest teeth whitening formulas on the market, but it's formula also reduces tooth decay and sensitivity. Simply apply the gel to your teeth, let dry for 30 seconds, and move on with your day: it is that easy. Find out why Smilebriter is the best teeth whitening solution on the market and order now.