If the pt's oral health is good, with no history of caries or perio disease, it does not mean that is how they will ALWAYS present. There is no reason to not see a dentist every 6 months, simply for preventative purposes. Even if it's just coming in for a quick checkup, it doesn't take longer than a few minutes. I personally would rather do that than possibly have the dentist discover something a year or so later, only to learn that he/she now has to perform corrective treatment rather than preventative maintenance.
Dental caries remain the most prevalent chronic disease, it's importance should be stressed instead of minimized.
I would also think that there would be a psychological effect to this approach. "Well, the dentist says my teeth are great so I don't need to see him for another year." So 12 months go by, 18 months, 24....etc.