I am really am curious though. Why did Bluebo's cat seemingly get bad breath after they started feeding wet? Is it similar to how when switching away from grains, some owners experience stool problems because the grain was masking a problem that was already there?Kitties can have all the same issues people do with their teeth and gums. A large part of it is genetic - though just like with people, diet and dental hygiene play a role.
All of our vets (we work with three vets at three different practices) recommend annual dentals. We haven't kept up with it for all 8 cats, but we do try to have dentals done for everyone at least once every two years, and for two cats that have dental issues, every year or six months, depending on the what the vet sees and recommends.
Here's a short article on the relationship between oral health and overall health: http://www.webmd.com/oral-health/gum-disease-health
It discusses the issue in people, but it's the same for animals - better overall health if good oral health.