Greenies grain-free dental chew. High in protein, low in fat, nutritionally complete. Clinically proven to keep dog's teeth clean. Easy to digest and fortified with added vitamins and minerals. Proven to fight tartar buildup and plaque, freshen breath, and maintain healthier teeth and gums. One dental chew per day helps clean teeth by using natural chewing action to wipe away plaque and tartar buildup from the surface of teeth.