Do you take your cat(s) to a vet or some kind of pet parlor for "nail" trimming? Or grind them down yourself? I know that when they get too long, they curve back and into the skin and it becomes painful to walk... and they can cut themselves when they scratch when the claws are too long. (That's a problem for our cat if we don't trim them soon enough.) So far we've used a grinder specifically made for this purpose and it's helped tremendously. She doesn't especially care for it being done, but it eliminates a few problems she'd have if we wouldn't do it. It doesn't hurt at all, but rather it's the noise of the thing that scares her.