Celebrities pose, donate outfits and sometimes even hair samples for their wax doubles. Here’s how the magic happens.

For decades, small grooves on ancient human teeth were thought to be evidence of deliberate tool use – people cleaning their teeth with sticks or fibers, or easing gum pain with makeshift “toothpicks” ...

In recent years, there has been a growing focus on developing smart dental materials that go beyond simply restoring form and ...