What is the spaces between the teeth of a comb called?

Please let me know. . . my exam is tomorow and I'm afraid I might get this question! I'm almost sure I'll get this question. . . think it will be like 5% of the exam!
Update: Okay I joked about the exam part. . . really bored, never thought that it had a name though. Wow Elizabeth your good!
4 answers 4