With Denta Shield. Carpet safe. Scientifically proven to block tartar. Reduces tartar by 83%. The American Veterinary Dental Society reports that 85% of all dogs over the age of 3 have some form of periodontal disease. The technology used in Hartz Dentist's Best with Denta Shield is the first and only rawhide chew that blocks tartar formation with the power of Hexametaphosphate. This ingredient was developed by researchers at Indiana University's School of Dentistry, for dogs. How does it work? The Denta Shield coating blocks the formation of tartar. Chewing this rawhide breaks down already existing plaque and tartar. Chewing this rawhide treat helps freshen your dog's breath. Scientifically proven to reduce tartar up to 83%. Studies on file at The Hartz Mountain Corporation. Made in Brazil.