Crossword Genius

Deposit on teeth (6)

Ross

I think it could be either:

tartar

plaque

'deposit on teeth' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for tartar that I've seen before include "Deposit that forms on teeth" , "Incrustation on teeth and gums" , "ancient Mongolian" , "A sauce to go with fish" , "For instance, Genghis Khan" .)

I've seen this clue in The Telegraph, The Star Tribune, the Evening Standard, The Times, the Universal and the USA Today.
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