Misc: Bonus pack! 2 refills + free base. Arm & Hammer: The standard of purity. Whiter teeth in 7 days (data on file). Baking soda & peroxide. For more information on our Arm & Hammer family of products, visit www.armandhammer.com. The baking soda & peroxide reaction. In a dual-chamber dispenser, baking soda & peroxide are kept separate. When you brush the two sides react & release powerful oxygen bubbles. Bubbling action formula breaks down stains & leaves teeth noticeably whiter. Easy-to-use refill. When your Mentadent pump is empty, simply remove the empty cartridge and insert the refill. It's easy, clean and convenient. Questions or comments? call 1-800-786-5135 M-F 9AM-5PM ET.