Oils won't stop the itching. Get an anti dandruff shampoo and anti dandruff spray. Blend onions and sieve out the shaff, apply the juice on your scalp before you shampoo your hair(ginger and garlic can be blended together but it's optional). Use peppermint oil. Try this in your routine then let me know how it's going. Then avoid using gels for now and greasy products.
