My Mimi is 13 years old. She has eaten dry food, only, for most of her life, and has had one cleaning in all of those years. I have noted in the last year or so that she really doesn't like the dry food or it is too hard for her, so I do supplement with canned now.

At the young age of your cat, I would definitely lean more towards the dry food, plus tartar control treats, and have wet food as a treat only on occassion.

Best of luck!

Logan