Reference for Shabbat 221:8

הדר ביה רבא מהך ממאי דמהך הדר ביה דילמא מההיא הדר ביה לא ס"ד דתניא כל חייבי טבילות טובלין כדרכן בין בט' באב בין ביוה"כ:

— There is no difficulty: the one refers to vinegar of fruit;<span class="x" onmousemove="('comment',' Rashi: Wine not fully matured in the grapes — that is injurious. ');">²⁰</span> the other to acid. Alternatively, both refer to acid: one means where there is a wound; the other, where there is no wound.<span class="x" onmousemove="('comment',' Or, swelling. ');">²¹</span> If there is a wound it heals; if there is no wound it loosens [the teeth in the gums].

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