Dandruff

Dandruff is purely a scalp disease, where dead scalp cells accumulate as flakes at the hair roots. It causes itchy scalps leading to further damage when scratched. Any damage to scalp may cause secondary infection leading to hair loss and affecting the health of hair in general. 
Dandruffs may be caused by aggravated vata dosha. Aggravated vata results in dry scalps. Improper maintenance of greasy hair may also cause dandruffs. Unhygienic hair conditions cause accumulation of toxins on the scalp, leading to hair dandruff. 
Easy Home Remedies 
Add 4 grams of camphor in 100 liters of coconut or neem (margosa) oil and store in a glass container. Massage this oil every night before bedtime, and if possible after baths.
Another simple hair massage oil may be made with one teaspoon each of castor oil, mustard oil and coconut oil. Massage your scalp with this every night before bedtime.
Massage your hair roots regularly with a mixture of one part of lemon juice to two parts of coconut oil. Leave on for three or hour hours, and wash off with warm water. You may massage this oil every night before bedtime before washing it off with a mild shampoo.
A concoction made with one part of sandal wood oil to three parts of lemon juice is highly effective. Briskly shake this mixture in a glass bottle before applying.