CLYSIDEN Gel. Whitening Gel with 0.27% of carbamide peroxide. Due to the emerging generation of oxygen CLYSIDEN Gel provides a quimiomecánica clean mouth and teeth. INGREDIENTS: Glycerin, Citric Acid, Urea Peroxide, Sodium Citrate, Disodium EDTA, Menthol. Directions for Use: 15 drops of Extender Clysiden whitening gel on your toothbrush and deposit, then toothpaste. Brush your teeth with this mixture for about 2-3 minutes, trying to distribute the product throughout the oral cavity. For maximum effectiveness recommended brushing teeth three times daily, after every meal. Precautions: Do not eat the product. Contents: 30 ml pump bottle of solution.