Maybe you did. I'll break a taboo: a person in my family keeps getting lice over and over! We constantly battle it, most likely because the person who won't be named is always taking selfies and sticking her hair next to everyone else's. Usually the rest of the family is free, but it never stops!
I don't know what it's like in the US, but England must be the nit capital of the world.
My job at the time was working for Children and Family Services, and I had to go into peoples' homes... people with children... who go to school.... Children who go to school often get head lice and pass it around. During that time, I switched shampoos to Herbal Essences, which was a relatively new product line, because it smelled really good. But then about halfway through my workday, I noticed that my head would
not stop itching. So I stopped off at the store on my way home from work and bought Rid and some garbage bags. As soon as I walked through my door, I put the clothes I was wearing into a bag and sealed it, and then I started combing the shampoo stuff through my hair. I kept checking that little comb for any sign of the things, and there was nothing. But my head was so itchy I was sure I would find a massive infestation. Two weeks later, I was still itchy, so I repeated the Rid... still no sign of nits or lice.
Finally, it dawned on me to try switching back to my old shampoo, and my scalp felt better within 24 hours. I should've known... my mother can't use shampoo with blue or green dyes in it. The Herbal Essences I got that time was a deep red colour, so I ignored it as a potential cause for those two weeks. But I'm pretty certain that was the problem. It hasn't recurred since, and that was about 20 years ago.
I've been using solid deodorant in the UK for at least 10 years, so they are definitely around.
I use Dove but you can also buy Mitchum and Bionsen in places like Boots, and looks like you can get Secret from some online sellers.
I use Secret... I most recently got mine from Amazon. If I could smell the other brands, I don't have a problem with switching, but I am particular about the scents I wear. I don't like many of them.