Picture that Actually Applies

Shoveling is most common on the upper central incisors (right smack in the middle of your face, under your nose). The edges of the teeth, closest to the tongue (hence lingual) build up, creating ridges around the center of the tooth. This trait is common in people of Asian descent, including American Indians.

"I'll bet the hardest thing about prize fightin' is pickin' up yer teeth with a boxin' glove on" -Kin Hubbard