Even whitened teeth don't pass with flying colours – two thirds of those questioned reckon naturally white teeth look better than bleached or professionally whitened teeth.
Atomic Kitten Liz McLarnon is supporting Listerine's campaign for Stay White, from £2.39, one of the brand's mouthwashes which is claimed to keep teeth whiter. She told us: "I don't worry about ageing because I would have surgery if I needed it. But I'm obsessed with my teeth, I've had them whitened but I use Listerine Stay White to keep them that way. I like the tingle on your gums!"
Stay White, from £2.39, uses a zinc chloride formula which is clinically proven to reduce the build-up of the tartar that causes discolouration and is available from supermarkets and chemists.