This taken from eHow - "Your hair is made up of atoms, which in turn are made up of electrons, protons and neutrons. If the atom has the same amount of protons and electrons, it is neutral. When electrons move from one atom to another, though, the atom can become positively charged, causing static."
Well, no matter what the cause, we have got dry hair and static, making it stick out like a porcupine and it is just not pretty. So, what are we going to do? This is the question I get asked most in the winter, and the answer is always the same: There really is no miracle cure for static! Dry hair is another issue.
For dry hair, first thing to make sure of is that you are hydrating yourself properly. You just cannot drink enough water for healthy skin and hair. I am always surprised at how few people drink an adequate amount of water on a daily basis. You can usually tell by looking at their hair and skin, believe it or not. The next thing to consider is how often you are shampooing your hair. If it is daily, think of shampooing it every other day, as that will help your hair to hold onto the oils it produces and therefore retain moisture. Also, refrain from brushing your hair, as this will only cause static. Use a wide tooth comb instead and once you have your hair styled - leave it alone! :) Also, think about adding a deep conditioning treatment into your beauty routine, once a week or every other week. Use a deep moisture penetrating one, leave on for 1/2 hour with a plastic cap and your hair will be softer and more hydrated.
We have tried it all; dryer sheets rubbed on the hair, Static Guard, spraying water on our hair, etc, etc. The best thing I have found to do with static, is to take a bit of an emollient paste on the tips of my fingers and gently smooth over the surface of my hair. That seems to hold the static at bay for a short while.
Winter is tough but with a little work and some fine tuning our beauty regiment, we CAN and WILL look beautiful! :)