Unless you've been raised by the most appalling skanks imaginable this is probably only directed at DiSsers who are no longer in fulltime education.
I remember going about 5 years without a checkup in my 20s. I was working with a guy who was my age and hadn't been for 9 years. We persuaded him it was probably time for a return. He went. Came back with 9 fillings.
I don't think I've been since 2005/6 and quite a few of my teeth feel pretty sensitive. Think I might book an appointment.