I went to the ortho today and got a new bracket. But not much else to report on the braces front. It’s the long slog.

So I Googled “smile” and was pointed to the Wikipedia entry. No surprise; but amazing I hadn’t checked it out already.

Anyway, here is one of the two main varieties of smiles:

  • The “Duchenne smile”, after the researcher Guillaume Duchenne, is the most studied, and involves the movement of both the zygomaticus major muscle near the mouth and the orbicularis oculi muscle near the eyes. An example of the smile is here. It is believed that the Duchenne smile is only produced as an involuntary response to genuine emotion, and is therefore what one could call the “genuine” smile. Due to the involvement of the muscle near the eyes, it is sometimes said that one can tell whether or not a smile is “real” by whether or not it “reaches the eyes”.

The other kind of smile is here.