Everyone is different but I find that RIGHT when you first feel the tingle that a cold sore might be coming, THAT is when you apply Abreva to the area. Recently I felt this, applied Abreva, rubbing it in 4 times a day and the cold sore never appeared. So I find it does help - now once you actually have the cold sore, it says applying Abreva shortens the length of the outbreak, but who knows?
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