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If little snow flurries shower your shoulders only on days when you're wearing hairspray, you may not be dealing with dandruff -- it's probably just the hair product that's flaking.
A heavy concentration of hairspray will make thick, gunky white layers in your hair that crumble and flake off throughout the day. Hold the hairspray can 8 to 12 inches from your head and keep it moving while you spray to make an even, diffused application.