Dandruff is a layman's term encompassing a number of dermatological conditions, which have you been diagnosed with? Self treating based on a self diagnosis can easily worsen problems by further damaging the skin barrier or increasing irritation.
There are a couple of types of T-Gel effective in mild seborrhoeic dermatitis and mild psoriasis respectively, sulphate surfactants are likely to worsen atopic eczema, irritant contact dermatitis and allergic contact dermatitis, also possibly SD.
2a-2c, medium texture, porous/ colour treated. Three years CG, growing out mechanical and chemical damage = breakage and very high porosity. Past armpit length heading for waist.
Treatments: Komaza protein, Komaza Matani, coconut oil with sugar syrup. Hairveda Sitrinillah
Leave in: Fructis Sleek & Shine (old), Gliss ultimate volume
Styler: Umberto Giannini jelly, Boots curl creme, Rockin RInglets
Experimenting with: Mega-Tek, Curl Harmony reviver, Elvive Full Restore 5.