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The citric acid in fresh lemons makes them a natural teeth whitener. Simply rub the inside peel on the teeth every day for whiter teeth. The approach to whiter teeth is very cost effective and can be applied quickly and simply. Using lemon peels lets you whiten your teeth, without using the harsh chemicals found in some whiteners. You should keep in mind that teeth whitening only works for your real, natural teeth. It will not work on any crowns, veneers, implants, or fillings