Yeah, but that’s the annoying catch 22... you very well could have dandruff only because you’re drying the skin on your head out too much. Just like the oils and nastiness on the rest of your skin, after a sufficient period your body could adjust and equalize and be fine.

I used to have terrible dandruff. Purely anecdotal, but I stopped using shampoo in my hair, and the problem mostly went away. I still wash it throughly, using only water, scrubbing hard with a towel when I dry off. My hair is noticeably less oily after washing, but it's no longer frizzy and stays in place better when I comb it. I have short hair.

I used to be the same way. While I generally scoff at "natural"-sounding cures, tea tree oil (sometimes called melaleuca oil) shampoos have literally cured my problem. I don't know the mechanics of it, but it works extremely well. If you feel like trying it, make sure you get one that is really strong smelling (not a bad thing, the smell is pleasant). I use Paul Mitchell, but others have worked for me too...just not the really cheap ones that barely smell like it.

Teatree oil has a very harsh smell that's impossible to ignore. Some people might find it pleasant, but I personally can't stand it.