The most common cause of bad breath in dogs is tartar buildup on teeth. Tartar or plaque in combination with bacteria, minerals and decomposed food can cause irritation of sensitive gums and may cause loosening or even loss of teeth. Veterinarians agree that proper dental hygiene is very important for maintaining your dog's good health. Nutri-Vet Breath & Tartar Biscuits help clean teeth and freshen breath with spearmint and parsley. Baked hard and crunchy, our biscuits help promote strong teeth and healthy gums and make your dog more pleasant to be around.