Canident is a blend of sustainably-harvested brown seaweeds that are farmed out in the cool waters of the Atlantic off West Ireland. The plants selected contain unique polysaccharides that studies show soften and reduce the tartar on your dog's teeth over time. We take great care how we dry our product, preserving these good bits. As always, please remember, dirty teeth is first and foremost a dietary issue, usually a lack of abrasion in the diet.  Giving such a seaweed-based product is not just about teeth cleaning, however. Seaweed is a popular food supplement for dogs as it is so rich in vitamins, minerals and antioxidants that boost your pet's health. CANIDENT SHOULD NOT BE USED IN DOGS WITH HYPERTHYROID ISSUES