Don't hide bad breath, treat it! Start now, your easy and effective dental routine with just 1 stick per day! Because your dog's bad breath may be a sign of serious dental problems, Purina experts have developed Purina Dentalife ActivFresh, which contains natural spirulina and honey to help combat bad breath at its source and not just cover it up. ActivFresh is designed with the shape, size, and chewy texture of Dentalife, which has been scientifically proven to reduce tartar buildup.