White TD, DeGusta D, Richards GD, Baker SG (1997) Brief Communication: Prehistoric dentistry in the American Southwest - A drilled canine from Sky Aerie, Colorado. American Journal of Physical Anthropology 103:409-414. [PDF]
Abstract -
A prehistoric Native American mandible from a Fremont site (circa AD 1025) in Colorado has a conical pit in the worn occlusal surface of the lower right canine. Natural causes for this modification are ruled out by the presence of internal striae, a finding confirmed by experimental replication.The canine was artificially drilled before the individual’s death and is associated with a periapical abscess. This is one of a very few examples of prehistoric dentistry in the world, and the first from the American Southwest.