The exact cause of dandruff or Pityriasis simplex capillitii is still unknown but here are some of the main suspected culprits:  Not enough brushing the hair: Those who do not brush or comb their hair at a regular basis, have a higher risk of getting dandruff. It happens because they are not complying with the shedding process of skin, which is aided by combing or brushing. Yeast: Those who are…