80s: keep your face straight. never smile in public places, never cry in other spaces. cleaning your teeth is aesthetically unnecessary as noone will ever see them anyway. so don’t bother.
early 90s: nondescript. but stick to dental neglect.
late 90s: start smiling. show partly exaggerated facial movements. but be careful now: years of dental neglect have left your teeth in a rather uncomely state.
early 00s: keep smiling. curb down remaining exaggeration of facial movements and let the dentist take care of the rest. get used to frequent experiences of stiff muscles due to over-excessive smiling. and laughing. wonder whether there’s a face behind the face, and reexamine “invasion of the body snatchers”.