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Bad breath in cats is most commonly caused by dental issues, such as periodontal disease or feline tooth resorption, a painful condition where tooth structure erodes at the gum line. Systemic health conditions may also alter breath odor—sweet or fruity breath can indicate diabetes, while an ammonia-like smell may suggest kidney disease. Because cats often hide discomfort, persistent bad breath warrants a professional evaluation. If your cat ever shows red-flag signs alongside bad breath, such as breathing difficulty, bleeding, sudden collapse, or an eye held shut, contact a vet immediately. Schedule a dental checkup with your vet to inspect your cat's teeth and gums.