Healthy Pets 15 Count Ora-Clens Oral Hygiene Chews, X-Large OraClensreg; Oral Hygiene Chews XLarge (15 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