Ah, I know that one. Ya get used to a mouthwash or a toothpaste.
When we first got here we got a Listerine mouthwash that was horrifically disappointing. It was sweet and I couldn't sort out if it was working or not, as far as helping prevent decay. Then found "Listerine Total Care" (mint) and it's a lot closer to that "singe off your tastebuds" Listerine from the States. I think we got it at either Boots, Tesco, or, potentially, Waitrose. Not an exact match, but I'm happier with it.