Nylabone Durable is a long lasting chew designed for powerful chewers. Be sure to select the right chew and size for your dog’s chewing style. Different dogs have different chewing styles, even within the same breed. Bristles raised during chewing help clean teeth and the clean action helps control plaque and tartar build up. Nylabone Durable is not consumable, but small shavings, no larger than a grain a rice, should pass through without effect. Replace when knuckles are worn down.