The mouth is the easiest part of the face to fake. People learn early that a smile smooths things over, so they offer one on cue — at parties, in meetings, across a dinner table they would rather leave. What they cannot fake as easily is what happens above the cheeks. A real smile recruits the muscles around the eyes; a polite one usually does not. That single difference is where most of my work in reading faces begins.

When someone is genuinely happy, the zygomatic major pulls the corners of the mouth up and the orbicularis oculi tightens around the eyes, creating those soft creases we call crow's feet. This second muscle is the honest one, because most of us cannot contract it on demand. So when you see teeth showing but the eyes staying flat, smooth and uninvolved, you are usually looking at a social smile — courteous, deliberate, and not necessarily felt. That isn't a lie. It is simply a smile worn for the room rather than for the moment.

Contempt: the smile that isn't friendly

The expression I watch for most carefully is contempt, because it loves to disguise itself as a smile. Contempt is the only emotion that shows up on just one side of the face. One corner of the mouth tightens and lifts — a small, asymmetrical pull, almost a smirk — while the other side stays still. It can flash for a fraction of a second and then vanish into a full smile, which is exactly why people miss it.

Contempt tends to appear when someone feels superior to the person in front of them. You see it in the moment a colleague disagrees with you and that one-sided lift slips out before the polite words arrive. You see it when someone is being praised to your face but does not respect you behind it. The cue is quiet, but the message is loud: I think I am above you. Once you learn the shape of it, you cannot unsee it.

What to actually look for

I am not asking you to turn every conversation into an interrogation. I am asking you to notice a few honest signals and weigh them against what the person is saying:

  • The eyes. Genuine smiles crinkle them. If the mouth moves and the eyes don't, the warmth may be performed.
  • Symmetry. A real smile is roughly even on both sides. A one-sided lift is the signature of contempt, not pleasure.
  • Timing. True expressions arrive with the feeling and fade naturally. A smile that snaps on a beat too late, or lingers stiffly after the moment has passed, is usually managed rather than felt.
  • Masking. Watch for a flash of something else — a tightened lip, a flicker of contempt — that gets quickly covered by a smile. The cover-up is often more telling than the smile itself.

Read the pattern, not the single frame

One micro-expression is a clue, not a verdict. A tired person, an unwell person, someone simply distracted can produce a flat smile that means nothing about you. The skill is not in catching one cue and announcing a conclusion. It is in collecting several small signals, lining them up with the words and the context, and asking what story they tell together.

This is why I treat micro-expressions training as a practice, not a party trick. The more faces you watch with patience, the more you stop reacting to the words alone and start noticing the feeling underneath them. And once you can tell a felt smile from a worn one — and a smirk of contempt from a moment of joy — you understand the people around you far more honestly than they intend.