White flakes , when sweats itchy ..... is it dandruff .... i work for 8 hours in a/c ... not used drink water significantly .... daily hair styling products ... may forgone to remove sometimes ... please help ... thank you?

It could be both: Dandruff is shedding of dead skin cells from scalp; it can be influenced by dryness, not washing enough, shampooing too often, seborrheic dermatitis, psoriasis, eczema, sensitivity to hair product or a yeast-like fungus. Your hair styling products may contribute; better hydration may help a little. Shampoos containing anti-fungals appear to be most effective. Try one of these first; then to Doc