Dettol is a staple in the first aid cabinet in Australia. I think every household has it - I love the smell of it!
I don't believe it harms anyone's brains though. Although, we are still apparently ruled by the Queen of England - perhaps Dettol has altered our minds and invoked our Royal submission?
However, overuse of anything can have a negative affect. I knew a Mummy who was a germaphobe and added Dettol to the kids' daily baths. The kids caught every bug that went by and I considered that it was because she never allowed them to build their immune system. Kids need to get dirty and play with other dirty kids!
Curiosity killed the cat, but satisfaction brought it back.