CET Oral Hygiene Chews for dogs. As simple as giving a daily treat, great tasting C.E.T. Oral Hygiene Chews feature the exclusive Dual-Enzyme System to remove plaque and prevents the buildup of harmful bacteria. The plaque-fighting enzymes and natural abrasive cleansing action of C.E.T. Chews help to keep breath fresh and teeth clean. Use C.E.T. Oral Hygiene Chews daily as a first step toward oral hygiene or on those days when brushing isn't possible. For use on dogs.