Opalescence Boost in-office power whitener is a chemically activated gel that provides brighter, whiter teeth after about an hour in the dental chair. The powerful 40% hydrogen peroxide gel is chemically activated, so it doesn't require a hot, uncomfortable light to work. Using the unique double-syringe configuration, the clinician activates the 40% hydrogen peroxide formula just prior to application, ensuring every dose of Opalescence Boost whitening is fresh and effective.Packing:2 x 1.2 ml Opalescence Boost/Activator syringes1 x 1.2 ml OpalDam Green syringe1 x IsoBlock1 x Shade guide card10 x Black Mini tips