I feed my cats mostly PetGuard and Precise.
From everything I've read, the 'dry food cleans teeth' is a major myth. It doesn't clean cat teeth anymore than eating pretzels
every day would clean human teeth. Genetics
seems to play a role in cat oral health though.

In my opinion this links on cat food categories is pretty accurate: http://www.paws.org/shelter/resource...1_copy(37).htm