The enamel on our teeth is the hardest tissue on the human body. A new study looks at the nanoscale structure of enamel from teeth dating as far back as 18 million years ago to see how it's changed.
It happens to everyone when you least expect it—a quick swig of hot chocolate after coming in from the cold and ouch! Your teeth react to the temperature change as if you had been chewing on tin foil.
Some results have been hidden because they may be inaccessible to you
Show inaccessible results