Whirlybirds teeth? (8)

I believe the answer is:

choppers

This clue is a double definition.

'whirlybirds' is the first definition.
('chopper' can be a synonym of 'whirlybird')

'teeth?' is the second definition.
(chopper is a kind of tooth)

(Another definition for choppers that I've seen is " In slang, false teeth or helicopters".)

I've seen this clue in the Sydney Morning Herald.

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