Bad breath in cats can be a symptom of various underlying unhealthy cat teeth issues or health problems. Regular dental care, including tooth brushing, dental diets or treats, and professional dental cleanings, can help prevent and manage dental problems such as tartar and plaque buildup, gum disease, and tooth decay. It’s important to consult with a veterinarian if you notice bad breath, red or swollen gums, tooth discoloration, or difficulty eating or chewing in your cat.