A first impression is often a feeling more than an evaluation. People decide whether you are safe, warm, or hostile before they decide whether you are competent.
A genuine smile is a signal: “I’m glad to see you.” It lowers defenses. It makes the room easier. It invites cooperation without a single argument.
The word “genuine” matters. A tight, forced grin reads like effort. Warmth reads like ease. So don’t treat it as a technique; treat it as an attitude—an outward sign of goodwill.
When you approach people with irritation, they mirror it. When you approach with friendliness, they often soften. Your face sets the temperature.
If you want to be remembered well, don’t try to be impressive. Try to be pleasant. A small change in expression can change the entire tone of a relationship before it even starts.