Scary mishap while removing fillings leads to the other molars showing evidence of disease (7)

I believe the answer is:

symptom

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'disease' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

(Other definitions for symptom that I've seen before include "Feature of a disease" , "It alerts one to illness" , "Indication (of disease, problem)" , "Evidence for disease" , "Expression" .)

I've seen this clue in The Irish Times.

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