The health of your scalp is vital for hair growth. So, giving it a hot oil massage twice a week is always recommended. For lustrous hair, use a mix of olive, coconut and castor oil. If you have a dry scalp, you can leave the oil overnight and wash it off next morning. But in case your scalp is oily, wash your hair two hours after the massage. Remember not to leave oil on your hair for too long as dust particles, chemicals and pollutants can accumulate, damaging the hair from root to tip.