You brush, you floss, you've kicked the habit, your teeth still go brown...

What's that all about then? It's nature 'avin a laff, innit. Healthy foods[1] are packed with polyphenols which are both powerful antioxidants[2] and stain your teeth.

[1] tea and coffee, dark coloured berries, red wine, turmeric.
[2] http://en.wikipedia.org/wiki/Polyphenol