Our teeth whitening system uses the purest & highest concentration of carbamide peroxide and hydrogen peroxide allowed. This unique, dental professional strength blend consists of these two highly concentrated components, and an activator. The LED bleaching procedure and gel product will not change the structure of the teeth, nor cause any damage to the enamel. Some people may experience some slight discoloration of the gums, but this should return to normal in 15 minutes. Studies show bleaching also contributes to destroying bacteria in the mouth and controls gingivitis and halitosis.