Anti-dandruff shampoos are the most commonly used remedy for a dry scalp. They usually contain selenium sulfide to help prevent dead skin cells and salicylic acid, which helps loosen dead skin so it can be washed away. There are also many home remedies for a dry scalp, such as crushing two aspirin into a powder and adding this to normal shampoo.
Aspirin contains the same salicylic acid found in anti-dandruff shampoos and has similar effects when added to normal shampoo. Adding a couple of drops of tea tree oil to shampoo may also help to keep the scalp from becoming overly dry, as well as massaging coconut or olive oil into the scalp about an hour before washing the hair. For even better results, let the oil sit in the hair overnight before washing it out in the morning.
Fungus is another leading cause of dandruff, which is why some people recommend washing hair with baking soda, a strong fungicide. Rinsing the hair with an alcohol-based mouthwash after shampooing can also eliminate fungus.
Improper pH balance is also a cause of dry scalp, so soaking the hair in apple cider vinegar or lemon juice may help reduce the problem. Sea salt can also be used as an exfoliant to help remove dead or dry skin cells before shampooing the hair.