I've actually had a dry scalp, but when scratched no dandruff. I've also had dandruff, but not an itchy scalp. And, I've had a dry, itchy scalp with dandruff.
For me, if my scalp is itchy but no dandruff, then I need a tiny bit of oil massaged on my scalp. If I have dandruff, but no itchy scalp, then it's the product. If it's both, then I used too much product. At this point I usually dampen my hair, and rinse my scalp with water. The problem is gone.
ModCG-Naturally Highly Porous and Dry
This list is not exhaustive...
Pre-treat: coconut oil, sometimes cheap red wine/banana
Clarifier: baking soda/brown sugar paste
Cowash: HE The Sleeker The Butter, HE NOYF w/Mandarin
PT: hiatus for now
DT:Redken Diamond Oil Deep Facets
LI/Detangler: MyDNA, Nu-Gro Leave-in
Stylers:AH Cupuacu & Burdock Sweet Hair Pudding, DVC Light Defining Gel
*experimenting and loving it!