Speed of your smile can influence people's first impressions of you
Smiling too quickly can lead others to think that you are insincere, while slow grins appear more genuine.
As part of the research, a team of business advisors examined how smiling can give clients a positive impression.
They discovered that a smile, which appears too swiftly and does not extend to the eyes can sends signals that you lack sincerity.
They found that people should avoid three types of grin: