Maintain your newly whitened teeth with our Gel Pen Refills, which are to be used in conjunction with your LED mouthpiece. Our enamel safe formula is clinically proven, vegan, and cruelty free. It removes stains from coffee, wine, soda, smoking, and more! What is it? Gel Pen Refills for when you have completed the initial 7-14 day application process with our Wireless Teeth Whitening Kit. Benefits: we guarantee results of up to 5-7 shades whiter teeth. Each whitening session only takes 15 minutes, and you’ll get 30 more applications with this refill kit. Key Ingredients: Carbamide Peroxide, Glycerol, Propylene Glycol, Deionized Water, Carbomer, Carboxymethyl, Poly Vinylpyrrolidone, Sodium Hydroxide, and Menthol.