Dandruff: what causes it and what actually helps
Why dandruff is not about hygiene, the yeast behind it, dermatologist tips on washing and shampoos, and where herbal scalp care fits.
2 min read · Updated 2026-11-14
Not a hygiene problem
The American Academy of Dermatology is clear that dandruff is not caused by poor hygiene, although infrequent washing can make flakes more visible. It is extremely common, and it tends to come and go with weather and stress.
What is going on
Most dandruff involves Malassezia, a yeast that lives on everyone's scalp and feeds on scalp oil. In some people, it triggers faster shedding of scalp skin, which shows up as visible flakes and itch.
What dermatologists recommend
- Wash regularly. Mild dandruff often improves with regular shampooing alone.
- Use a dandruff shampoo if needed, containing zinc pyrithione, selenium sulfide, ketoconazole, salicylic acid or coal tar.
- Leave it on for 5 to 10 minutes before rinsing, as directed on the label.
- Alternate between two shampoos with different actives if one stops working.
- Massage it into the scalp, not the lengths, especially if your hair is curly, as the actives can dry hair.
Where herbal care fits
A 2002 trial found that a 5 per cent tea tree oil shampoo improved dandruff compared with placebo. Neem and tea tree appear in many herbal scalp products. They can be part of your routine, but if flakes persist, a medicated shampoo or a dermatologist visit is the right next step.
A note on oiling
Heavy oil left on an oily, flaky scalp for hours may make things worse. If you have dandruff, oil the lengths rather than the scalp, or wash it out thoroughly.
This guide is general information, not medical advice.
Questions
Is dandruff caused by a dry scalp?
Not usually. Dandruff is more often linked to an oily scalp and Malassezia yeast. True dry scalp flakes are smaller and drier.
Will oiling cure dandruff?
Heavy oils left on the scalp can sometimes feed Malassezia and make flaking worse. If you have dandruff, wash oil out well.
Can herbal products treat dandruff?
Tea tree oil has some evidence in a shampoo at 5 per cent. Most herbal scalp products are best used alongside, not instead of, a proven dandruff shampoo.
When should I see a doctor?
If flakes persist despite a dandruff shampoo, or if your scalp is red, very itchy, painful or has thick scales, see a dermatologist.
Sources
This guide is general information about traditional and natural care. It is not medical advice. For a skin, scalp or health condition, speak to a dermatologist or qualified practitioner.
