A dazzling white smile might be essential for Hollywood stars. But those glow-in-the-dark teeth aren't right for most people, according to scientists who have worked out a formula for the perfect smile. They took several factors into account, including the size and width of each tooth, the curve, colour and shape of the teeth and the overall width of the mouth. picked by AutumnLotus 10 months ago tags smile scientists secret perfect teeth tooth |
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