Whitening Teeth with Lemon Juice
Procedure: Brushing teeth with lemon juice
Lemon juice is an acid and can harm your teeth. You may end up with a LOT of cavities and irreparably damaged tooth enamel. The reason that lemon juice "works" is that it causes the teeth to lose calcium (which gives teeth some of their off-white color). Calcium is a major component of healthy teeth, and once it is lost, your teeth become very susceptible to decay. DO NOT use lemon juice for whitening.
Whitening Teeth with Wood Ash
Procedure: Brushing teeth using wood ash (i.e. from your fireplace)
The reason wood ash whitens your teeth is because it contains potassium hydroxide (aka lye). However, only hard wood ash contains significant concentrations of potassium hydroxide. Soft wood ash does not. Before lye was available commercially, soap was made by leeching the potassium hydroxide from hard wood ash and then combining it with tallow (rendered animal fat). You may want to exercise caution when using hard wood ash too often as a tooth whitening agent. The harshness of the potassium hydroxide could significantly damage your teeth over time.
Whitening Teeth with Strawberries
Procedure: Brushing teeth using mashed strawberries
It is not advisable to brush your teeth with strawberries. The sugar and acid in the strawberry will harm your teeth more than it will help if you don't immediately brush your teeth with regular toothpaste. If you choose to brush with strawberries, be sure to brush your teeth immediately afterwards with fluoride toothpaste, and also to floss.
Whitening Teeth with Baking Soda
Procedure: Using Baking Soda with toothpaste while brushing
Baking Soda won't bleach your teeth, but it will help get plaque off and make them shine. Be warned that Baking Soda is an abrasive and if you use it too much, the enamel on your teeth can get damaged.
From : http://www.teethwhiteningreviews.com/artman/publish/
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