ProDen PlaqueOff Powder for Cats is a 100% natural pet food supplement containing the natural kelp ingredient A.N ProDen - shown in clinical trials to help reduce plaque & 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 cat's ordinary food once a day with the supplied scoop. ProDen PlaqueOff Powder for Cats has a tasty formula containing brewer's yeast specially made for cats - your cat won't be able to resist it! A 40g bottle can last approximately 4 months.