Put a tiny bit of toothpaste into a small cup, mix in one teaspoon baking soda plus one teaspoon of hydrogen peroxide, and half a teaspoon water. Thoroughly mix then brush your teeth for two minutes. Remember to do it once a week for pearly whites :)
Use Activated Charcoal on teeth for dramatic results w/out sensitivity. Buy Activated Charcoal at GNC or Vitamin Shoppe. Let it sit on teeth or rub w/ old toothbrush for 5 minutes. Can repeat once/week to keep teeth white.