Greetings. SEBORRHOEA CAPITIS/ SEBORRHOIEC DERMATITIS OR DANDRUFF is a chronic problem. Please note. Avoid using oils on scalp. This acts as food for fungus causing dandruff. You can apply it only at the hair part and not the scalp for short durations if you wish to. Secondly wash hair with antifungal / low strength corticosteroid based shampoos(when dandruff is severe). Use maintenance shampoos - like follidense or trichosoft regularly if u wish to shampoo you hair more than twice a week and dont wish to use ketoconazole based shampoo. You may need a course of oral antifungals if your condition is severe. See a dermatologist near you. Hope this helps.