Don't hide bad breath, fight it! Start with easy and efficient dental care with 1 stick per day. Because your dog's bad breath can be a sign of serious dental problems, the experts at Purina developed Purina® Dentalife® ActivFresh®, containing natural spirulina and honey, to combat bad breath at its source rather than just it. but to cover. ActivFresh® is designed with the shape, size and chewable, porous texture of Dentalife® which is scientifically proven to reduce tartar formation.