Healthy Pets 30 Count Ora-Clens Oral Hygiene Chews OraClensreg; Oral Hygiene Chews Small (30 Chews) features a blend of the enzymes Lacto peroxidase and Glucose Oxidase, which help prevent plaque and tartar build up as well as promote clean teeth Oral Hygiene Chews also feature an abrasive texture, which help scrub your dog's teeth while he chews Note: Expiration date format is YY/MM/DD