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is caused by a fungus called Malazessia. This fungus is a normal commensal( residing in the body). Some people will mount an allergy
against it causing dandruff. This fungus lives in oily skin.
Use a shampoo containing Ketoconazole
2% and ZPTO 1% thrice a week for a month. After that continue using once a week at least for maintaining the improvement. Do not apply oil on your scalp
Head & Shoulders shampoo which you were using has ZPTO1%. This also will help but you need to maintain using it atleast once a week after you use it thrice a week for a month. As that fungus is a normal resident of your skin, the principle of dandruff treatment is to keep its colony down. So do not stop the treatment completely. L'oreal is not required.
Hope this helped