I  have been having the Trader Joe's Greek yogurt in my for quite some time. After having an hair cut, suddenly I developed Dandruff problem. I had an idea of mixing a cup of Greek yogurt with 2 tbsp of Lemon juice and mix it. I applied  it  to my hair  from roots to ends. I washed my hair with shampoo and conditioner after 30 minutes. The same mask I repeated after 3 days. You will not believe the result, I am completely dandruff free just after 2 uses.The amount of yogurt varies according to length of hair.Applying Lemon juice  directly on the skin is not advisable.The results may vary according to the intensity of the dandruff problem.