Have you ever wondered why dogs stare at their water dish before drinking? If your dog has a choice, They will prefer to drink running water as their instinct tells them that it's clean. Dog H2O water fountains will filter and clean water 24-7 and together with dental care by Dog H2O, help provide improved daily oral hygiene while simply drinking water; Helps protect against plaque and tartar build-up, for healthier gums and fights doggy breath; designed to work seamlessly with Dog H2O water fountain; each pack contains 8 tablets, each tablet lasts about 4 days when used with the Dog H2O water fountain; eco-friendly to ship and store, each pack weighs 1.3 ounce [35G], much greener to ship around than bottles of water additives; Dental care by Dog H2O is also suitable for cats [hope they share]; ingredients: Water deionized, dental plaster, glucose oxidase enzyme, Potassium Sorbate. For pets with allergy or medical condition, consult Veterinary before use.