Maybe just rinse with warm saltwater, although it probably won't really "rinse" the cuts much.
No, you're probably not going to die or get dysentery or something, I don't think.
It probably won't affect you at all, provided that you don't regularly use an overconcentration of mouthwash.
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I have had to use a different mouthwash very frequently for the past few weeks, like at least 3 times per day. I used it about 2 hours prior to using the listerine as well. Could that have any effect?