PROFESSIONAL TEETH WHITENING KIT - If any pens are leaked, please contact us in time. Our Professional Teeth Whitening Kit includes 1 Super Bright 16-Point LED Light, 4 Teeth Whitening Gel Pens & an Easy to Follow GuideQUICK AND PAINLESS - Use once a day for 15-20 minutes to whiten all type of stains from coffee, wine, soda, smoking, and more with light-activated acceleration technology. Unique formula which is same enamel-safe whitening agent used by dentists guarantees that your teeth will experience maximum whitening effect without sensitivity or painSAFE & EASY TO USE (GOOD FOR FIRST TIME USERS) - There are no harmful side effects to the teeth, gums, braces, and veneers. No mess or molds. Can be used with Braces, Veneers, etc. REUSABLE: work with any refill gelHOW TO USE - Remove a Charcoal Gel Applicator and twist off the security cap. Use half of one tube to apply an equal amount of gel to the upper & lower gum trays. Place the gum tray in your mouth, ensuring the gel covers your upper and lower teeth. Activate the Blue 16-Point LED Light and leave on for 15-20 minutes. Remove the gum trays and rinse off all gel with water after using. Note: In order to protect your eyes, please do not stare at the cold light for a long time.