Don't waste money on expensive teeth whitening kits. Crush 1 ripe strawberry and a 1/2 teaspoon of baking soda together in a container. The malic acid acts as an astrigent remove color discoloration from things such as coffee, wine and dark soda. Use a soft toothbrush to spread the mix onto your teeth. Leave on for 5 minutes and then thoroughly brush teeth with toothpaste and then rinse. Do this once a week and watch your teeth transfer into a whiter, brighter smile!