I have a 14yr old cat,who has basically always eaten canned food,at his last check-up,the vet said he has the nicest teeth he'd ever seen in a 14yr old cat.
Dry food and good teeth are a myth.
Wellness and other good foods,might be a bit costly,but pays for itself in the long run,with less vet-bills.
"The cruelest animal is the Human animal"
3 kitties,Rocky(r.i.p my boy),Chico,Vinnie