The patented design of Indigenous Dental Health Bones helps clean teeth and freshen breath, while fighting plaque and tartar build-up. They are safe and highly digestible for all dog breeds and sizes. Dental Health Bones are made with ascophyllum nodosum, a natural kelp harvested from the clean, cold North Atlantic seas of Canada, Iceland, and Norway. This kelp is a rich source of nutrients and is free from artificial colors and preservatives.