Measures that are very helpful to prevent the Dandruff include. Use a good anti dandruff shampoo. Leave the shampoo for at least 5 five minutes on your scalp before rinsing. Be gentle while shampooing; clean your scalp regularly with a gentle shampoo. Washing your hair at least twice a week or every alternate day if you have dandruff is very much necessary.Do not scratch your head; Avoid wearing cap always as it will prevent sun to reach scalp and will promote yeast which causes dandruff; Do not expose your hair to excessive heat and Avoid stress and indulge in balanced diet and regular exercise for good immunity.