Not Any More!
I was in my teens, without much money. A small ad advertised a device which was very simple: a kind of comb, coupled with an old fashioned razor blade. With this, simply by setting the blade and combing your hair, you could save a fortune in bills. So I did, although it probably always looked a mess! On day, I set the blade too close to my skin and shaved a line down my head, right to the skin, leaving a moth eaten effect, which could not be disguised – even by the chortling barber to whom I hurried! I have never used this tool again, but remember coming across it, at the back of a drawer, a few years ago.
If they still sell these things, my advice would be: don’t buy one!