How to detect fake smiles?

Detecting fake smiles involves observing subtle nonverbal cues. Robert Greene explains that a genuine smile activates the entire face, not just the mouth. The eyes light up, and facial muscles are engaged, indicating genuine emotion. In contrast, a fake smile primarily involves the mouth and lacks the lively eye expression. Recognizing this can reveal insincerity and can be particularly useful in discerning genuine interest in romantic or interpersonal relationships. It can also help identify toxic individuals who display charm without genuine emotion, which is often visible in their eyes, described as "dead eyes" by Greene 1.