With Opalescence Xtra Boost, you will have whiter teeth before you leave the dental office. This product is so advanced, it does not require a laser or a light for activation. This product is so advanced, it does not require a laser or a light for activation. Through enhanced chemical activation, we can now whiten your teeth without the bothersome heat or harmful ultraviolet rays. The product simple activates itself as it sits on your teeth. It’s simple. It’s easy. And, in about an hour, you’ll have noticeably whiter teeth.