In traditional northern Vietnam, chewing betel nuts and blackening teeth were once standard cultural practices among women. Chewing betel nut, known as "ăn trầu," symbolized hospitality, social bonding, and beauty.

The custom of blackening teeth, or "nhuộm răng đen," was another defining trait of Vietnamese women in the past. This practice was a mark of beauty and a cultural symbol of maturity, loyalty, and resilience. Women would use natural ingredients, such as plants and herbs, to dye their teeth black, which required patience and careful preparation. The blackened teeth were thought to protect against decay and were considered a mark of distinction, separating humans from animals with white teeth.

These practices reflect a unique perspective on beauty and identity in Vietnamese culture. They highlight a time when traditional values and aesthetics were deeply woven into daily life. Today, though these customs have faded