I use dry shampoo quite often for two reasons:
- I dye my hair red and want to minimise colour fading.
- I'm really lazy.
In the summer months, I don't want to be washing my hair every single day. Dry shampoo gives me more volume and texture, and keeps my hair matte and fresh.
DON'T spray it all over your head as if it was hairspray. Unless grey hair is the look you're going for, then by all means.
DO use a comb to make a number of partings across your hair - spray down each parting, along the roots. This gets the dry shampoo exactly where you need it, and minimizes the white/grey powdery residue.
Read more: https://www.reddit.com/r/TheGirlSurvivalGuide/comments/1cosu7/tip_use_dry_shampoo_the_night_before/