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.
Mod CG-Naturally Highly Porous and Dry
SUMMER REGIMEN-This list is not exhaustive...
Pre-treat:Shima oil
Shampoo:
Schwarzkopf Gliss Kur Ultimate Oil Elixir
Cowash:HE The Sleeker The Butter
PT: Gold Medal's Power Gro Hair Builder and Conditioner
DT/LI/Detangler/
: various
Stylers: AH Radiant Curl Enhancing Gel'ee

*experimenting and loving it!