Is it uncommon for cats over age 10 to have issues with their teeth or have teeth that need to be removed? I've heard that around 80% of all cats have some form of gingivitis by age 5, and that you should brush your cat's teeth. Yet this is a new concept and wasn't even an option a decade ago, and people still had cats live 15-20 years and didn't lose all their teeth. I personally know a lot of people with cats, and don't know anyone who's ever brushed their teeth. We've tried dental treats such as feline greenies and CET, some dental catnip toys with netting to chew on, as well as dental sticks (that no one seems to eat, except for 1 cat) and bought pet toothbrushes and toothpaste, and no one has yet to accept getting their teeth brushed.