Misc: Whiter teeth in 7 days (Data on file). Baking soda & peroxide. The standard of purity. 2 refills better value! Try our other Arm & Hammer Oral Care products. For more information on our Arm & Hammer family of products, visit www.armandhammer.com. 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. 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.