2,000-year-old skulls reveal people in ancient Vietnam permanently blackened their teeth — a stylish practice that persists today
Favicon 
www.livescience.com

2,000-year-old skulls reveal people in ancient Vietnam permanently blackened their teeth — a stylish practice that persists today

In a study of 2,000-year-old skulls from Vietnam, archaeologists discovered that iron was the primary component that dyed teeth black.