What is the best way to get rid of horrible dandruff?

Depends: See a dermatologist. You may have psoriasis, fungus infection, seborrheic dermatitis, or an effect from a med. Meanwhile get in your shower every day with a shampoo. There are shampoos with tar, salicylic acid, selenium sulfide, zinc pyrethium. You wil see t-gel, t-sal, selsun, head & shoulders and others. Dhs-zn is twice as strong as head & shoulders in the white bottle. You may need prescrip.

Dandruff: Dandruff is a common scalp condition in which small pieces of dry skin flake off of the scalp. If you have dark hair or you’re wearing dark colors, you may notice the flakes in your hair or on your shoulders. Dandruff may also make your scalp itch. https://www.aad.org/public/skin-hair-nails/hair-care/how-to-treat-dandruff