When is it appropriate to use "Scar Tissue" vs. "Scar Tissues"
He applied ointment to the scar tissue.
He applied ointment to the scar tissues.
Are both correct or only the first one?
When referring specifically to "tissue" in the biological sense, not "tissue" as in the paper sense, the rules for usage are as follows:
Thus, in your sentence, I would say :
Because he's only referring to one type of tissue.
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