New research that indicates humans may have arrived in Europe much earlier than previously thought also raises some intriguing questions.

Higher levels of social isolation, but not loneliness, is associated with faster tooth loss in older adults in China, a new study shows.

A new 130-million-year-old fossil "shakes up the evolutionary tree" of ichthyosaurs, which were ancient animals that look eerily like living swordfish.

Scientists weren't sure if a rare frog species, Gastrotheca guentheri, had real teeth, so they zoomed in on some froglet jaws to find out.

Scientists weren't sure if a rare frog species, Gastrotheca guentheri, had real teeth, so they zoomed in on some froglet jaws to find out.

Proton pump inhibitors, drugs prescribed for heartburn, could have a beneficial effect on gum disease, according to new research.

"We were able to show that the first tusks belonged to animals that came before modern mammals, called dicynodonts," researchers report.

New formulas can calculate the body size of a primate based on the root size of its teeth.

New research zeroes in on what's proven to keep your teeth clean and healthy. But it also shows some common tools may not be all they're cracked up to be.

Milk, including horse milk, helped prehistoric people expand across the Eurasian steppe during the Bronze Age, say researchers.