People interested in receiving London teeth whitening treatment could be happy to hear that British people reportedly have more genuine smiles than Americans.

Psychologist Dacher Keltner has uncovered a number of distinct differences between the way people from the US and UK look when they are happy, Dentistry.co.uk reports.

During a study, Mr Keltner revealed that participants were able to identify the difference between the two because the British smile looked more difficult to fake.

British people tend to expose their teeth when they smile, as well as raise their cheeks to expose crow's feet around the eyes.

However, their American counterparts stretch the corners of the mouth more by parting their lips.

This news comes after a survey by the British Dental Health Foundation revealed that people find a smile to be the most attractive feature in the opposite sex.

Conducted to celebrate the start of the National Smile Month campaign, the study found that 56 per cent of people viewed the feature as the most important in a potential partner.