The Glo Whitening System uses a special tray designed to be speedy and safe, using a professional strength whitening gel. The Glo system combines light and heat in the special tray to activate the whitening gel. The heat and light make the hydrogen peroxide more effective and don’t cause sensitivity. The Glo Science whitening system has been designed to be fast, efficient, and safe. This advance in technology allows the dentist to get rid of messy trays and light guns. The patented light system, the Guided Light Optics (GLO) unit combines light plus warming heat in an enclosed system that activates the professional strength GLO Whitening Gel. The technology combines heat and light to optimize the specially designed hydrogen peroxide paste. The system is so safe that it can be used on caps, crowns, bonding, and veneers.