Ora-Cleans Chews help clean your don'gs teeth while they chew.;Ora-Cleans Chews have a blend of the enzymes Lacto Peroxidase and Glucose Oxidase, which help prevent plaque and tartar build up.;Ora-Cleans Chews are made of beefhide coated with enzymes that help remove plaque and prevent harmful bacteria from building up.