9 Yr old Rhodesian Ridgeback Mix used to have really awful breath, and often suffered from gastric disturbances...diarrhea, soft stools, gas. I changed his diet to home cooked meals using human grade organic, no steroid, no additives ingredients. For those times I cannot cook for him, I purchase canned and dry pet foods made from human grade, organic ingredients. Despite the change in diet, dog's breath still needed improvement. Veterinary exam showed dog had healthy gums and teeth, so conclusion was that bad breath was due to dog's poor digestion. With these drops, there was big improvement. Vet noticed it too. I will continue giving him these drops daily. It works.