Prozym RF2 sticks contain an exclusive patented ingredient, RF2. This prevents bacteria from forming biofilms, the first essential step in the formation of dental plaque. Prozym RF2 sticks therefore prevent the appearance of dental plaque and tartar and effectively combat bad breath. The unique consistency and ergonomic "Star" shape of Prozym RF2 sticks ensure a tempo Extended chewing, which helps fight plaque and tartar in dogs. The improved vegan formula is ideal for dogs with kidney or heart problems or allergies to animal proteins.