Opalescence Boost in-office whitener is chemically activated, so it does not require a light for whitening. Syringe-to-syringe mixing activates the product just prior to application. The activated 40% hydrogen peroxide is conveniently delivered via syringe and applied to teeth for whitening. Two to three 20-minute applications for a total of 40–60 minutes of treatment time, not exceeding 3 applications in one visit. Kit contains 2pcs 1.2ml Opalescense Boost/Activator syringes, 1.2ml OpalDam Green syringe, shade guide card, IsoBlock, black mini tips. ONLY THIS TIP CAN BE USED WITH OPALESCENCE BOOST.