Crossword Genius

___-B (toothpaste brand) (4)

Ross

I believe the answer is:

oral

(Other definitions for oral that I've seen before include "By word of mouth, like some exams" , "Via the mouth" , "Spoken, of the mouth" , "By word of mouth (4)" , "Type of exam" .)

I've seen this clue in the USA Today.
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