Crossword Genius

Flat whites you wouldn't want to swallow (6)

Ross

I believe the answer is:

molars

I'm a little stuck... Click here to teach me more about this clue!

'flat whites' is the definition.
Although both the answer and definition are plural nouns, I can't see how one could define the other.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for molars that I've seen is " Grinding back teeth".)

I've seen this clue in The Independent.
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