Catherine Zeta-Jones

If you're after that all-American, perfect smile, it might just be worth taking a leaf out of Catherine Zeta-Jones' book - the actress apparently rubs strawberries on her teeth to help remove stains, although those in the know suspect she could be doing more damage than good.
"Strawberries contain a natural exfoliating substance called malic acid which can help to remove stains, but there's no need to rub the fruit onto the teeth as an excessive amount can damage enamel," warns a spokesperson for Beverly Hills Formula toothpaste. "Instead, opt for a whitening toothpaste, which will whiten teeth and help to protect against tooth decay."

We recommend: Boots Smile Whitening Fresh mint toothpaste, boots.com