Crossword Genius

Act on oral treatment for tooth cavity? (4,5)

Ross

I believe the answer is:

root canal

'tooth cavity?' is the definition.
(type of cavity in a tooth)

'act on oral treatment' is the wordplay.
'treatment' indicates anagramming the letters.
'act'+'on'+'oral'='actonoral'
'actonoral' with letters rearranged gives 'ROOT CANAL'.

'for' acts as a link.

(Other definitions for root canal that I've seen before include "oral passage" , "bit of tooth" , "Dental passage" , "area sensitive to extraction?" .)

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