Your teeth play important roles in your daily life, but have you ever wondered how humans evolved to have them? Skin scales ...

What causes birthmarks? They're often harmless, but their origins have puzzled doctors for years. More than 10 % of babies are born with some kind of birthmark.

In a challenge to the notion that teething disrupts infant sleep, researchers found no major differences in sleep time and night waking around a tooth eruption.

A newly described species from the Burgess Shale had three eyes, clawed limbs, and a tail full of gills—plus internal organs ...

Mothers never liked to blame their babies for failed telephone service. After all, what harm could a bit of saliva do? Yet in the early decades of the 20th century, reports of liquid-gone-wrong with ...

Dental hygienists know a thing or two about keeping teeth healthy ... damage that certain habits can do. Tetra Images / Getty ...