I assume you're being facetious, this just isn't true. Brushing and flossing won't re-align teeth, correct major problems for which you have a genetic disposition, address factors beyond your control like the chemistry in your mouth, extra or absent teeth, dry mouth or physiological factors like how you sleep or the impact of respiratory considerations.

Sure, brushing and flossing helps, but to say it eliminates dental professionals is absurd. That's like saying a healthy lifestyle means you'll never need a doctor or visit a hospital.