tooth floater
n.— «Jim Johnson of Sacred Heart has been a horse tooth floater for 15 years. He uses something that looks like a giant nail file called a “float”—the name used years ago for leveling or planing tools. He swears it doesn’t hurt the horse.» —“Taking a license to work” by H.J. Cummins Star-Tribune (Minneapolis, Minnesota) Sept. 22, 2005. (source: Double-Tongued Dictionary)