For medium dogs 20-55 lbs. DentaShield. Crunchy outside. Chewy inside. Scientifically proven to block tartar (Studies on file at the Hartz Mountain Corporation). Providing for your dog's dental health is important. The American Veterinary Dental Society reports that 80% of all dogs over the age of three have some form of periodontal disease (American Veterinary Dental Society). Hartz Dentist's Best Chew Treats blocks tartar formation with the power of DentaShield. The patented technology in DentaShield was developed by researchers at Indiana University's School of Dentistry, and is offered exclusively by Hartz. Hartz Dentist's Best with DentaShield Chew Treats combines a hard, crunchy outer layer with a tasty, soft and chewy middle to provide an effective dental treat that your dog is sure to love. How does DentaShield work? Chewing the hard outer layer breaks down already existing plaque and tartar; The unique DentaShield technology blocks the formation of tartar; Hard, long lasting outer layer; Chewy bacon flavored center; Treat your dog to better dental health! Made in China.