Its 30% & 24% hydrogen peroxide formula swiftly removes yellow stains, delivering rapid whitening while prioritizing safety and quality, enhanced by patented technology. Treatment gels are designed to be used with the GLO In-Office Tech Kit; it features gentle warming heat and light technology to activate and accelerate the whitening gel for maximum efficacy (with little to no sensitivity), and reduces chair time. Post-Whitening Enamel Serum effectively conceals imperfections as it fortifies enamel against sensitivity, erosion, and future stains.