Manual or Mechanical?

Back and forth goes the argument—what toothbrush is best? Gadgeteers can spend $150 for an electric brush designed to rotate and oscillate, with angled neck, sure-grip handle, dual speed control, and even a timer. Researchers say that rotation-oscillation electric brushes remove plaque and reduce gingivitis better than any other kind—but only slightly better. Do-it-yourselfers can pick up a manual toothbrush for under $3 at the pharmacy. Replace it every three [...]