Not necessarily. While a lack of crinkles around the eyes can be a sign of a potentially fake smile, it is not a definitive indicator. It is important to consider other cues such as the position and movement of the eyebrows, the shape of the mouth, and the overall expression of the face to determine whether a smile is genuine or not.
A genuine smile, also known as a Duchenne smile, involves the contraction of the orbicularis oculi muscle around the eyes, which creates crinkles or crow's feet. However, some people may have less prominent or visible crinkles due to factors such as genetics, age, or skin elasticity.
Therefore, it's important to consider the context of the situation and other nonverbal cues to accurately interpret someone's smile. For example, if someone's smile is accompanied by positive body language, such as leaning in or making eye contact, it may be more likely to be genuine. Conversely, if someone's smile is accompanied by negative body language, such as crossed arms or avoidance of eye contact, it may be more likely to be fake.