Dandruff is the result of a fungal infestation, psoriasis, dermatitis, or flaking skin.  Henna is anti-fungal, can be effective against psoriasis, and can strengthen skin.  Many people who have itching, flaking scalps after dying with chemical dyes are developing an allergy to para-phenylenediamine and other chemicals.  Henna can be used to dye hair instead of chemicals, and can restore healthy hair and skin.  

Do not use henna on any juvenile who has G6PD deficiency.  Glucose-6-phosphate dehydrogenase deficiency (G6PD deficiency) this is an X-linked recessive hereditary disease featuring abnormally low levels of the G6PD enzyme, which plays an important role in red blood cell function. Individuals with the disease may exhibit nonimmune hemolytic anemia in response to a number of causes, and one of these is causes is exposure to henna. Males are more likely to be harmed than females. G6PD deficiency can be determined by a simple blood test administered by your physician.