We recently got a 3 month old kitten and he's teething. The other day, me and the hubby fixed pizza and the crust was a bit, well, rock solid sounds like a good word. Our kitten, being a curious little guy, starts sniffing my pizza so I gave him a bit of crust. He just sat there gnawing on it. So I told my hubby not to throw the crusts away. I put them in a ziplock bag and that not-so-edible crust makes a great chew stick for our little guy. He hasn't been chewing on our cords and he's stopped biting us.