Yep, I think sometimes it just doesn't matter. Me personally? I went to the dentist a little over 6 months ago for a cleaning. I bought a Sonicare toothbrush, have been flossing religiously, brushing 2-3x a day, went 2 weeks ago for a cleaning and found out I have 3 more small cavities
Jackson's teeth stay pretty good if I brush every day. Once I begin slacking, I notice the tarter build up fairly quickly. He's on a every 2 year dental "schedule" right now and that seems to work best for him.