Add Yahoo as a preferred source to see more of our stories on Google. x-ray scans of early human skulls. the teeth are colored red, green, orange, blue, and purple to show the differences among them ...

Not everyone wants their teeth to be white and gleaming. Tooth blackening is a recognized part of modern Vietnamese culture, ...

For the first time, archaeologists have used advanced scientific techniques on 4,000-year-old dental plaque to confirm traces of betel nut chewing in ancient Thai communities. Betel nuts are usually ...