A team of researchers led by Gen Suwa of the University of Tokyo has used statistical methods to calculate when canine teeth in modern male humans began to shrink down to their current size. In their ...

Frightened babies expose their teeth; happy babies stretch their lips without extreme tooth exposure. Other primates expose their teeth with open mouth when threatened or with the mouth nearly closed ...

The discovery of a 300-million-year-old extinct reptile has provided evolutionary insight into the predatory nature of mammals. A study conducted by University of Bristol researchers and published in ...