Pro Plan Cat Adult Optirenal Salmon & Rice 400g is designed especially to keep your cat's kidneys healthy as their urinary system is one of their key protective systems. Some cats especially older ones may experience some form of kidney problems which can in some cases lead to a build up of waste and therefore dangerously high levels of toxins. Pro Plan Cat Adult Optirenal Salmon & Rice 400g was developed by nutrition experts and vets to ensure it effectively supports your cat?s kidney function with a controlled PH formula which helps to maintain kidney health. Pro Plan Cat Adult Optirenal Salmon & Rice 400g is made from the highest quality Salmon for optimal palatability and its highly digestible protein and carbohydrate sources ensure that few indigested nutrients reach the lower intestinal tract resulting in good stool quality and a lower faecal output. It is also proven to help you cat?s teeth and gums by reducing tartar build up by 40%.