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How to whiten up your teeth in two minutes

The tough enamel covering our teeth is largely made up of a mineral called hydroxyapatite – which is composed of calcium and phosphate ions arranged into rod-shaped crystals. But molecules of food and drink can become lodged between these crystals, discolouring the teeth.

As peroxide is an oxidising agent it ‘steels’ electrons from the molecules staining the teeth, disrupting the chromophore –…