There isn't one single reason, but a primary reason stems from cultural etiquette, particularly in East and Southeast Asia.
Cultural Etiquette and Modesty
-
Traditional expectations: In many East and Southeast Asian cultures, traditional etiquette dictates that women should cover their mouths when smiling or laughing. This is because exposing one's teeth while laughing can be considered impolite or immodest.
- Example: As the provided reference states, "Chinese traditional etiquette dictates when women smile/laugh, their teeth should not be visible. So I was told as a kid that I need to cover my mouth when smile or laugh. In fact this is a pretty common etiquette through out East and Southeast Asia."
-
Historical roots: This practice often has roots in historical ideals of femininity and decorum.
Other Potential Reasons
While cultural reasons are significant, here are some other possible, though perhaps less prominent, reasons:
- Self-consciousness: Some individuals, regardless of gender, may be self-conscious about their teeth and instinctively cover their mouths when laughing to hide them.
- Habit: It can also be a learned behavior or a simple habit developed over time, perhaps unconsciously imitating others.
- Perception Management: Some might believe it looks more attractive or demure to cover their mouth when laughing, thus managing how they are perceived by others.
Summary
The gesture of covering the mouth while laughing is often rooted in cultural norms and etiquette, particularly in East and Southeast Asia, where it is traditionally considered more polite for women to conceal their teeth when laughing or smiling. Self-consciousness or learned habits can also contribute to this behavior.
