we have two 7 week old kittens. we were told not to use scoopable with them at an early age, because they would play in it and eat it. so we got them some stuff called...wait, let me go check...Cat Works. I'm not sure what it is, but I don't think it's clay. The lady at the vet reccomended it. well, they like to chew on this stuff, so I'm wondering when we should go back to scoopable. I know about doing it slowly, bit by bit, but I don't know how old they sould be when I do it. any advice?