Answer:

BICUSPID

Answer	Crossword Clue
BICUSPID	Premolar
BICUSPID	Canine neighbor?
BICUSPID	It's found behind a canine

BICUSPID	Premolar tooth
BICUSPID	Canine's neighbor

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.