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People with whiter teeth are more likely to land their dream job, have success in romance and have higher salaries, according to a 2007 study. No wonder teeth whitening is a multi­billion-dollar business! Whitening agents are effective and safe in moderation, but they're not for everyone.

Did you know that certain foods naturally cleanse, brighten and defend your mouth against bacteria that can harm your teeth and gums? There are two key factors you should keep in mind when it comes to a white teeth diet: chewing and saliva production.