I can't speak for other generations, but I know that in my generation things generally don't work unless they hurt. I wonder if this generation of kids out there will be the same way, I doubt it though, with all the pain free alternatives out there these days. What I'm talking about is how things like Listerine (Original), iodine, peroxide, isopropyl alcohol, etc sting or burn a bit when we use them.
Awhile back I bought a bottle of "Listerine Total Care Zero". The first time I used it I noticed it didn't burn a little like the "Listerine Original" does. Of course, it also doesn't contain alcohol like the original formula does. The lack of pain was a bit disappointing to me. I realize that may sound a bit odd, but the pain somehow reassures me that it's working. I think next time I'm going to buy the mouthwash with alcohol in it instead.
Moving on to first aid. I don't know about you, but when I was a kid and I got a cut my mom would always wash the area first, then use peroxide to clean it. She'd gently blow at the cut afterwards to help ease the pain caused by the peroxide. I'm willing to bet that this practice was a big instrument in programming my brain that unless it hurts it's not working. These days I'm more of a fan of using iodine on my shallow cuts and using something like isopropyl alcohol or peroxide for the deeper ones.