In this tutorial, we learn how to whiten teeth in one minute using household items. You will need: a lemon, baking powder, and a cup to do this. First, pour baking powder into a cup and then squeeze the juice of a lemon into the cup. After this, mix the two together until you have a paste and all water. Now, rinse your mouth out with this mixture. Do this several times a week and you can get your teeth to become eight shades whiter! This is a great way to whiten your teeth without having to spend all the money on the expensive store products!