Kirkland Signature. No Preservatives. 72 box count. Grain-free and gluten-free dental chews are safely digestible with no artificial colors flavors or preservatives. Chews are two-sided with a groove and multiple levels of ridges and nubs to help clean teeth and reduce plaque and tartar from a variety of angles. The paw-grip handle is designed to work with your dog's natural instinctive chewing style.