As my hair gets longer, and despite regular use of a shampoo containing Zinc Pyrithione, the dandruff comes back. Dandruff is, of course, one of the great social no-nos of the age. This leaves me with two alternatives.
The first alternative is to have my hair cut short.
The second alternative involves long nights in the garden shed with a can of paraffin, some candle stubs and a spatula. And the all-too-real risk of having the neighbours alert the police when they hear the screaming.
JustMeAgain
As to the dandruff ... you might consider trying one of the shampoos from Faith in Nature.
Look at the Rosemary, Tea Tree and Aloe Vera variants.
(Don't expect instant results with just one application.)