Hartz Chew ‘n Clean Dental Duo combines edible dental benefits and a chew toy all in one! The durable nylon outer shell is filled with a bacon-flavored treat that will satisfy each dog s desire to chew. The treat portion contains DentaShield® a special ingredient that helps reduce new tartar formation. By chewing Dental Duos it will help keep your dog s teeth clean and massages gums to provide overall better dental hygiene. This total package will pique your dog s interest and keep them engaged with the toy to deliver total chewing satisfaction. Available in a variety of sizes and colors the Dental Duo dog toy fits every dog s chewing needs. This toy is suitable for mild-to-moderate chewers.