I've recently been trying out some natural beauty recipes. I knew that strawberries are natural teeth whiteners, but heard a tip to mix Bi-Carb Soda with them for an extra boost of white and decided to give it a go.
Simply cut up a strawberry into small pieces, as seen below. Mash it up with a fork, add in a 1/4 of a teaspoon of bi-carb soda and mix together. Take a soft toothbrush and put a decent chunk of the mixture onto it. Start rubbing this onto your teeth as if you were brushing them, making sure to get the juices over all your teeth. Leave to sit on your teeth for about 5minutes and then rise your mouth.
This method isn't going to whiten your teeth dramatically after one use, but over time will help to maintain whiter teeth by getting rid of stains caused by coffee or darker coloured foods.
I like to use Crest Whitening Strips maybe twice a year, as well as a whitening toothpaste and mouthwash. Recently I've been testing out the Oral B 3D White combination. This strawberry method I will continue every week or so and see how it goes.