Strange customs.

I want to know how all of the strange customs that we adopt in our modern culture came about. Things that aren't naturally so. My brother and I were talking a little bit about wisdom teeth yesterday, and we wondered why it is that it's necessary to remove wisdom teeth at all. Why would God give us teeth that we didn't need or use, or even have room for in our mouths? And what did people do before there was such a thing as wisdom tooth removal? On that note, teeth are kind of interesting. I'm sure that toothbrushes and toothpaste haven't always existed, so why is it so important now that we brush our teeth regularly (to keep our mouths fresh and free of cavities), or flossing? Who ever came up with flossing, anyway?

Also, this custom of women shaving their legs and armpits, and men shaving their faces, or the plucking of . Don't worry, I fully endorse these practices. I generally don't like facial hair (on guys or girls, for that matter), and I shave...but I don't understand why I have to. Why do I even grow hair on my legs if I'm a girl and girls aren't supposed to have hairy legs? It makes no sense to me.