Dental Care Bones are the only chews on the market that contain the 100% natural and clinically proven kelp ingredient A.N ProDen®. Dental Care Bones help oral problems with double action - ProDen PlaqueOff System® and the bone's unique shape helps to prevent new plaque and tartar from forming when used as directed, resulting in a fresher breath. They also contain omega 3 and 6 fatty acids and antioxidants that support immune health.