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If his breath is that bad, do get him looked at. Cats are very good at hiding pain and dental disease can cause organ failure in animals, especially elderly ones

No worries. He is a neat cat, but his problem is not his gingivitis. He is just old. Follows me around when I take care of the chickens, eats chicken food dead frogs and more. Have checked his teeth and gums which are fine. Just stinky Cat breath!