Dry Kelp Powder DogProDen PlaqueOff Powder is a 100% natural pet food supplement containing the natural and organic kelp ingredient A. N ProDen shown in clinical trials to help reduce plaque and tartar and to help improve bad breath. The results are usually seen between 3 to 8 weeks, with continued use. Sprinkle the powder over the dogs ordinary food, wet or dry, once a day with the supplied scoop. For a 10kg dog, a 60g bottle lasts roughly 6 months.