This has to be the number one question asked. So I know just how important it is to people to have the whitest teeth possible. Here is a few ideas but please be advise I would suggest seeing a dentist to avoid doing any thing harmful to your teeth that will cost you more in the long run.
Here are some suggested home remedy that may help to whiten your teeth.
1)Brushing with Lemon Juice
2)Brushing with Baking Soda
3)Brushing with Hydrogen Peroxide
4)Brushing with Salt
5)Rubbing Strawberries on your teeth then Brushing off.
However, all though the above may help to whiten your teeth they can do damage as well. They contain sugar and acids and are abrasive, all of which can damaged your enamel that helps protects your teeth from tooth decade
I hope this information is helpful to you