Bad breath in dogs can be a sign of dental disease. The exclusive active ingredient RF2 in Prozym Dental Sticks eliminates biofilm caused by the bacteria in the mouth of dogs. Biofilm is the first stage of dental plaque, so treating it early can prevent more serious problems. The unique star shape of Prozym Dental Sticks guarantees a longer chew time, which helps fight plaque and tartar through more direct contact with the stick.