This unique design puts brush & paste at your finger tips. Each brush comes pre-filled with an enzymatic, hydrogen peroxide gel that fights bad breath & tartar build-up. The gel is activated by the pet's saliva & is safe to consume. Designed not to foam, there's no need to rinse. The soft bristles are non-abrasive to the gum line. Easy-to-use...simply push the handle into the head to force the toothpaste up through the bristles. Approx 4 INCH L. Tasty poultry flavor.