C.E.T. Enzymatic Oral Hygiene Chews for Dogs feature an exclusive Dual-Enzyme System, plus an abrasive texture. Working with the dog's chewing action, C.E.T. Enzymatic Oral Hygiene Chews reduce plaque and tartar helping keep teeth clean and breath fresh, even on days when brushing isn’t possible. Available in Petite, Medium, Large and Extra-Large sizes.