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I think he had a very, very good smile, for somebody whose teeth were somewhere between so-so and bad. What seems not a whit onerous to write about is the mechanics of it. His smile often went backward or forward when all the other facial traffic in the room was either not moving at all of moving the in opposite direction. His distributor wasn't standard, even in the family. He could look grave, to to say funereal, when candles on small children's birthday cakes were being blown out. On the other hand, he could look positively delighted when one of the kids showed him where he or she had scraped a shoulder swimming under the float. Technically, I think, he had no social smile whatever, and yet it seems true (maybe just a trifle extravagant) to say that nothing essentially right was ever missing in his face.
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J.D. Salinger (Raise High the Roof Beam, Carpenters & Seymour: An Introduction)