Crossword Genius

Much such work is done in the head (6)

Ross

I believe the answer is:

dental

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'much' is the definition.
Although both the answer and definition are adjectives, I can't see how one could define the other.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for dental that I've seen before include "sort of surgeon" , "Pertaining to teeth" , "surgery" , "concerned with choppers" , "Concerned with teeth" .)

I've seen this clue in the Evening Standard.
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