Can't really comment - I had a cat who lived to be almost 20 - he was only ever fed wet food - and his teeth were perfect . My younger cat - he is 14 years old - has had the same diet - and he has had to have several teeth removed - his teeth were not in a good state ever - I put it down to us having his a less then 4 weeks old (abandoned on a farm) and never having the correct nuitrants in the womb - and in the early days of his life - could be very wrong - but there are two extremes that i can only base my opinions on.
regards
DT