Go nuts Swish coconut oil for 5 to 20 minutes a day, allowing the natural lauric acid to remove the bacteria that results in discoloration. Go red Paint a crimson pout to give the illusion of whiter teeth. the blue undertones will contrast against that pesky yellow tint. Go fruity Crush a couple strawberries, mix in a few pinches of baking soda, and brush away with your home- made paste. the malic acid helps lift plaque, which can cause dullness.