The Garfield Replacement Oral Care Kit contains one dental block. These Dental Blocks are specially designed to work seamlessly with the Garfield Cat Fountain (sold separately) to improve pet dental health. They contain Glucose Oxidase to protect against plaque & tartar buildup, promote healthier gums and give your cat fresh breath. Plus there's a calcium supplement for stronger teeth. With the benefits of these dental blocks added to the benefits of your Garfield Cat Water Fountain, how can you not feel you not only have the best cat fountain, but the best pet drinking fountain in the market?