Scientists had discovered 11 drilled tiny holes in molar teeth of skulls found in a remote graveyard in Pakistan.

Why the hole were done, no one will know but since the holes were drilled in molars, researchers think it was done to reduce cavity pain and not for a decorative reason, the holes were as deep as seventh of an inch.

"The holes were so perfect, so nice," said study co-author David Frayer, an anthropology professor at the University of Kansas. "I showed the pictures to my dentist and he thought they were amazing holes."

Researchers believe small bow used to drive the flint drill into patient’s teeth, flint drills were found on site.

"Definitely it had to be painful for the patient," author Roberto Macchiarelli said, an anthropology professor at the University of Poitiers, France, Macchiarelli and colleagues simulated the technique and drilled through human.