I free feed my cat Royal Canin dry kibble for indoor cats (with furball control). Yes, I know most of you recommend the wet stuff, but my cat's a rescue from the humane society. There's no way he'd let me near his mouth with a toothbrush! So kibble and Greenies denta treats it is to keep the tartar off his teeth. Judging by his coat, eyes and activity level, doesn't seem to be doing him any harm.
If you're green, you're growing...if you're ripe, you're rotting!
I try to greet the world like my pets do...boundless enthusiasm, intense curiosity and no concept of yesterday and tomorrow.