What is Dry Shampoo? #1 Natural option is best for the planet too

Dry shampoo is a powder that soaks up excess oil in your hair and scalp, water free. They can also give you hair extra volume and boost. If you're travelling and need a freshen up, it can be done in a rest room or airplane toilet.

Sprinkle the dry shampoo powder on to your roots either straight from the bottle (if it has an appropriate dispenser) or get a brush from your mineral makeup kit (a foundation brush for example) and use it to apply to the places you need to soap up excess oil.
For hair that's extra oily, apply a little more generously and comb through your hair. Leave for around 5 to 10 minutes and then comb any excess out of your hair.
BIG TIP #1 - you absolutely MUST apply this only to dry hair. If your hair is wet, it's going to clump and you'll have to shampoo it out.
BIG TIP #2 - if you have dark hair and find the light powder leaves some light colour in your hair, mix a little cacao powder in with it before application or choose a brand that does a light and a dark shade and buy the dark one.

Absolutely. What is dry shampoo if it's not a multi-tasker. Apply the dry shampoo to the roots of your hair, parting it, applying the shampoo, then parting it a couple of centimetres over and repeat the process until you have covered your scalp. Brush through your hair and then blow out and style as usual. When used this way, dry shampoo will extend the life of your blowout.

It's not a good idea. While you're not going to cause any harm, with daily use, dry shampoo will build up on your hair and also on your scalp. It will make your hair look dirty as it builds up. It's effective when used once or twice in between washes, but not every day.

If you use dry shampoo all the time and don't wash it out, over time, not only will it build up, but you may get rashes, inflammation and/or dandruff from the build up. Dry shampoo is effective when used once or twice in between regular washes only.