Public smiling in photographs probably started in the 1920s. Photography just took too long for people to hold a smile in the early years of photography. So, they sat still instead of sitting happy. Then photos got faster and people started to smile for those photos. But, probably most if not all of us suspect people actually did smile prior to 1920. We just don’t have photo-documentation. And way long ago, George Washington probably didn’t smile for his portrait because his ivory-tooth...
