wrong, the best is the one with the most tar. Tgel only has .5%, but denorex has 3%. its the shampoo that tingles. its pretty expensive though. 10 bucks for a smallish regular size bottle. trust me, i had dandruff like that. my dermotologist said it was slight case of psoryasis (?). gave me some "tar" sample shampoos, and told me to get a shampoo that had the most tar.
or you could just shave your head.
edit: dandruff is caused by oily scalp, and when it dries, it leaves what we like to call dandruff
edit2: tip, when you shampoo ur head, don't gently massage it. you gotta be agressive and use your nails and fingers and dig at your scalp.
eidt3:
http://www.denorex.com/thera-strength.htm
"Contains one of the highest levels of coal tar available without a prescription -? more than twice the coal tar found in Neutrogena T-Gel Extra Strength and five times the coal tar in the other Neutrogena T-Gel formulas."