Cleanliness of scalp
Try to keep your scalp clean. try not to use chemical products.. Wash your head with normal tap water without using any chemical shampoo on regular basis. One thing can be done is application of sour curd and  lemon as shampoo which will not only remove the dirt but also make your scalp dandruff free.  Avoid touching your scalp specially if you are bald because it will only give you more hair fall. After washing our hair generally what we do is take towel and rub it on our head.. well stop doing that. just dab it along gently..