Interestingly, even forced laughter can be effective. Researchers say the brain cannot distinguish between a genuine and a fake smile.

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Yet the challenge remains: how do you fake authenticity? Engineers can program a smile, but without the micro-contractions around the eyes, many of these expressions still seem disingenuous.

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A man who tricked women into believing he was a paramedic before raping one and sexually assaulting two others has been jailed for 12 years.

Living in Thailand taught me that beneath those welcoming smiles often lies a layer of insincerity, particularly when money is involved. It’s something many expats experience but few openly discuss.

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Veneers have been as important on the red carpet in recent decades as a couture outfit...but a raft of stars are resisting the orthodontist in favour of dental authenticity.