| That it takes nearly three times the number of muscles to frown as it does to smile. Frowning requires forty-three, whilst smiling uses only seventeen | In 1971, 40% of all adults aged over 18 years didn’t have any of their own teeth left | We cry at birth; begin smiling at five weeks and start laughing between four and five months. Babies quickly learn that whilst crying gets attention – smiling keeps us there | A smile is a universal expression of happiness and recognised as such by all creatures |
| Women smile around 87% of the time compared to 67% for men | A female is 26% more likely to return a smile from the opposite sex | Smiling releases endorphins and makes us feel happier | A person who studies laughter is called a ‘gelotologist’ |
| A great smile is associated with good health and also suggests you’re wealthy | There are 18 different kinds of smile used in a variety of social situations | In 1971, 40% of all adults aged over 18 years didn’t have any of their own teeth left | Children laugh around 400 times a day |
