Fresh Breath includes chicken, parsley, peppermint oil and chicory. Parsley is a source of chlorophyll, a natural deodoriser. Peppermint not only gives breath a fresh scent, it can also aid digestion. Poor digestion is often a cause of bad breath. Chicory is a natural prebiotic that can help the functioning of the digestive system. The biscuit's abrasive action can clean your dog's teeth as they chew.