Question: how to whiten your teeth with lemon juice?
Answer: #4 Baking soda and Lime or Lemon Juice Lime and lemon contain citric acid which is an effective bleaching agent. To use, mix half teaspoon of baking soda to half teaspoon of lime or lemon. Use your toothbrush to brush your teeth with the mixture. Let the mixture sit for a minute before washing it off.