Here’s a bite-sized fun fact to bring up at dinner tonight (or during your next teeth cleaning).

The world’s oldest dental filling is 6,500 years old, as discovered by a team of scientists in Italy. The jawbone in which it was lodged was dug up early last century near the village of Lonche in Slovenia. At the time, the find—one of the oldest human bones ever unearthed in the region—was described, catalogued and filed away in a museum in a nearby town. The jawbone stayed in the museum for 101 years, until two Italian physicists recently decided to use the specimen to test their new x-ray imaging experiment. To their surprise, they found a beeswax filling in the left canine crown of the Neolithic man (who was likely between the ages of 24 and 30). Talk about lasting dental work!

Want to keep your teeth cavity-free—or at least take care of the fillings you’ve got? Check out our guide to healthy teeth.