"The new teeth wear the old ones as 'hats' until they are ready to erupt. So, piranhas are never toothless..."

Proteomics, a new forensics tool, means "reading DNA when you don't have any DNA to read." Here's how the technique works.

How to choose a toothbrush? To pick the right one, you have to consider the needs of your hand, mouth, teeth, and gums.

A new method is letting researchers get at the ancient proteins preserved in a rhino tooth fossil from almost 2 million years ago.

Rather than head to the dentist to stave off tooth decay, crocodiles just grow fresh chompers, research shows. Could we do the same one day?

Gorillas have teeth that are best for chomping on fruit and leaves, so researchers were surprised to see them using brute force to bite into nuts.

Scientists in Peru's Amazon jungle have uncovered the 18-million-year-old remains of the smallest fossil monkey ever found.

DNA and stable isotope analysis indicate the skull belonged to a male, first-generation narwhal-beluga hybrid.

"Chasmaporthetes probably hunted herds of ice age caribou and horses or scavenged carcasses of mammoths on the vast steppe-tundra..."

Conventional wisdom says Crest Whitestrips never should have happened because big companies lag at innovation. Not so, research finds.