Royal Canin Cat Oral Sensitive 30, Feline Premium Dry Food, 400g (0.8 pounds) Double action for optimal oral hygiene: The unique kibble shape and texture provide a tooth brushing effect which helps reduce plaque formation. Active components in the diet trap the calcium in saliva, and help prevent it from being deposited on the teeth in the form of tartar. Result: a 59% reduction in tartar formation (measured on the most vulnerable teeth, compared to a control food not containing the active components - Royal Canin study, 2005. Proven effectiveness after 28 days of exclusive use of Royal Canin Cat Oral Sensitive 30). size: 0.8 pounds