Hydrogen peroxide whitening gel at 35% for in-office use. Self-mixing system Single application per session Contains calcium: maintains the integrity of enamel. The product may be kept up to 50 minutes in contact with the teeth without having to be changed, since the pH remains neutral and stable during the whole session. The remaining content can be stored and used later. The product has bluish-green color and does not change color during the process, thus facilitating visual control.