Zeus (maybe - name not fully decided) (otherwise known as Gaia) had his first vet check-up today and the vet nurse was talking to us about food and I said he was on a wet food only diet and she said that was bad for him and his teeth!!

I know that cats are true meat eaters and all that jazz, Zeus is on Natures Menu kitten pouches and then when he is older it will be adult pouches with raw food nuggets every so often so I understand his diet and know that wet food is better for him.
But, is what she said about his teeth a wee bit true? She said that the dry kibble cleans them while wet cause tartar build up...
Please give me advice