Supersmile Activating Rods are designed to be used with our Professional Whitening System to maximize teeth whitening results. Professional Activating Rods simulate the first step in the Smigel technique for in-office whitening. The activating serum gently and safely prepares the tooth enamel’s surface to jump-start the whitening process. Free of silica, parabens, sulfates, known allergens, animal by-products and BPA. It's also Kosher.