Filed teeth was a characteristic of West African born youth, not central American people.
Mainly. Not exclusively.
This is the first known case of tooth filing in Europe, but it was common practice in the Americas between AD 800 and 1050. Since the skeletons date from around the same time, this raises the possibility that the Vikings picked up the practice during their travels. Arcini hopes future finds will reveal where the practice arose and how it spread.
This came from the The New Scientist article that blam pointed us to.