Both Myndi and Sparky had bad breath, but I couldn't do much of anything for it, other than breath fresheners which weren't all that effective. Their teeth were their issue, and since they both had heart murmurs, then couldn't safely have the anesthesia that would be required for them to have a dental cleaning. Their vet would manually scrape off as much tarter as she could when I would have them in to her for any other reason. That at least was better than doing nothing at all.