Hi, I can understand you concern for dandruff. You have not told your age, sex and occupation in your query. YOu can use ketoconazole 2 % shampoo on daily basis for one week and tehn use alternate days for next few weeks. You will get good benefit by this. Hair fall after straitening is a common problem due to breaking of disulphide bonds of the hair. In straight hair there break in bonds and so causes hair fall. You can take vitamins in the form of biotin, calicium pantothenate and other vitamin B complexes. Eat a lot of green leafy vegetables and sprouts which contains vitamins and minerals necessary for normal hair function. Take care.