Over-exposed gums. Do certain ethnicities have this more than others?

[Kazimiera]

When some people smile they show over-exposed gums.

I was wondering whether this is a genetic trait in some groups. I've heard that the Irish often have this.

http://www.realself.com/files/214177.JPG

http://www.wellnesskliniek.com/userfiles/image/gummy-smile.jpg

http://www.carterabbottmedspa.com/wp-content/uploads/2008/03/DSC_0059.jpg

[Tchek]

Obviously spaniards, especially women

[Jebivjetar]

It's found all across the board, no ethnicity specifically can claim it as their own trait.

[arcticwolf]

Doesn't that have something to do with the width of the mouth?

http://www.drawing-faces-and-caricatures-made-easy.com/images/conan-obrien-and-mr-average-hair.jpg

[Piper]

Last time I noticed this trait was at two women: one very blond Australian and one Erithrean. So I'd say it doesn't have much to do with ethnicity.