Dandruff Treatment: What Actually Works, According to Dermatologists

Shampoo bottle, towel, and comb in a clean bathroom for treating dandruff

Dandruff is common, it isn’t caused by poor hygiene, and in most cases a medicated shampoo with the right active ingredient helps. Dermatologists at the American Academy of Dermatology (AAD) and Mayo Clinic agree on the basics: choose a shampoo with a proven ingredient, use it the way the label says, and adjust how often you use it for your hair type. Here’s what works, what doesn’t, and when to see a doctor.

What Is Dandruff?

Dandruff is a common scalp condition in which small pieces of dry skin flake off the scalp. It may make your scalp itch, and the flakes are easier to see if you have dark hair or wear dark colors. It tends to be more common in the cold, dry months of winter.

Dandruff can develop for several reasons, including oily skin, hair care habits, and medical conditions. A dermatologist can tell whether your flaking is a sign of a condition such as seborrheic dermatitis, psoriasis, a fungal infection of the scalp, or eczema.

Step 1: Wash Regularly

You can usually treat mild dandruff at home by washing your hair regularly. Mayo Clinic suggests washing more often with a gentle shampoo to clear away extra oil and dead skin, gently massaging your scalp to loosen flakes, and rinsing well.

Step 2: Choose a Shampoo With a Proven Ingredient

The AAD says effective dandruff shampoos contain at least one of these ingredients:

IngredientWhat it does (per Mayo Clinic)
KetoconazoleHelps kill or slow the fungus that may cause dandruff
Zinc pyrithioneHelps kill or slow the fungus that may cause dandruff
Selenium sulfideHelps kill or slow the fungus that may cause dandruff
Salicylic acidHelps with itching, scaling, and flaking
Coal tarHelps with itching, scaling, and flaking. May stain or darken light-colored hair and make your scalp more sensitive to sunlight.
SulfurListed by the AAD as an effective ingredient

Check the active ingredient on the label rather than relying on the product name.

How to Use It

  • Apply it to your scalp and lather. Gently rub it in.
  • Leave it on. The AAD says some dandruff shampoos need to sit on your scalp for about 5 to 10 minutes, and a Mayo Clinic dermatologist notes that most need more than 5 minutes. Check your bottle, since the instructions differ by product.
  • Rinse thoroughly. You can shampoo and condition with your usual products afterward if you need them.

How Often to Use It (It Depends on Your Hair)

Hair typeAAD guidance
Fine or naturally straight hair, or an oily scalpWash daily or every other day, and use your dandruff shampoo about twice a week
Coarse, naturally curly, or coily hairWash when needed and use your dandruff shampoo about once a week, if tolerated. Apply it only to your scalp, since the ingredients can dry your hair.

Mayo Clinic adds that some people tolerate dandruff shampoo 2 to 3 times a week, and that people with curly, coiled, or textured hair may want to use it less often.

Rotate, Be Patient, and Don’t Stop Too Soon

  • If one shampoo doesn’t work, the AAD recommends alternating between shampoos with different active ingredients. Mayo Clinic notes that dandruff routines can become less effective over time, so a dermatologist there recommends rotating among up to three shampoos with different active ingredients.
  • Give it a few weeks. If you’ve used a dandruff shampoo for a few weeks and it isn’t helping, see a healthcare professional.
  • Keep it up. When your dandruff improves, you can use the shampoo less often, but Mayo Clinic suggests continuing at least once a week to help keep it from coming back.

Protect Your Scalp From the Sun

A scalp sunburn can increase flaking, and coal tar shampoos can make your scalp more sensitive to UV rays. The AAD suggests wearing a hat, or trying a powder or spray sunscreen, which is easier to apply to your scalp. See our guide to sunscreen myths for what dermatologists recommend.

Other Habits That Help

Use fewer styling products. Gels, sprays, and other products can build up on your scalp, which can make it oily and worsen dandruff, according to Mayo Clinic.

What Doesn’t Have Strong Support

  • Tea tree oil: Many shampoos contain it, but Mayo Clinic says there is no strong evidence it helps with dandruff, and it may cause allergic reactions in some people.
  • DIY cleansers: Homemade mixes can irritate your scalp. Our guide to baking soda shampoo explains why.

Safety Notes

  • If a shampoo causes itching, burning, or stinging, stop using it.
  • If you have an allergic reaction, such as a rash, hives, or trouble breathing, get medical help right away.
  • Some ingredients can affect hair color or stain light-colored hair, so check the label if your hair is dyed or light.

When to See a Doctor

For most people, dandruff doesn’t need medical attention. See a healthcare professional if your dandruff doesn’t go away after you’ve tried these steps for a few weeks, or if it’s severe. A dermatologist can check whether another condition is involved, and may prescribe a stronger shampoo, medication, or a steroid lotion.

The Bottom Line

Dandruff isn’t a hygiene problem. Regular washing plus a dandruff shampoo with an ingredient like ketoconazole, zinc pyrithione, selenium sulfide, salicylic acid, sulfur, or coal tar helps most people. Match the frequency to your hair type, rotate shampoos if one stops working, and see a dermatologist if it doesn’t improve. For more on scalp and hair health, see our guide to biotin and hair loss.

Frequently Asked Questions

Is dandruff caused by poor hygiene?
No. The AAD calls that a common misconception. Dandruff can come from oily skin, hair care habits, and medical conditions.

What’s the best ingredient in a dandruff shampoo?
There’s no single best one. The AAD lists zinc pyrithione, salicylic acid, sulfur, selenium sulfide, ketoconazole, and coal tar, and recommends switching to a different ingredient if one doesn’t work.

How often should I use dandruff shampoo?
It depends on your hair. The AAD suggests about twice a week for fine, straight, or oily hair, and about once a week for coarse, curly, or coily hair, if tolerated.

How long does it take to work?
Give it a few weeks. If it isn’t helping by then, see a healthcare professional.

Does tea tree oil help dandruff?
Mayo Clinic says there’s no strong evidence it does, and it can cause allergic reactions in some people.

Can I stop using dandruff shampoo once it clears up?
You can use it less often, but Mayo Clinic suggests keeping it up at least once a week to help prevent a return.

AUTHORITATIVE SOURCES

  • American Academy of Dermatology: “How to treat dandruff” (aad.org) and AAD news release (December 2023)
  • Mayo Clinic: “Dandruff: Diagnosis and treatment” and “Dandruff: Lifestyle and home remedies”
  • HealthDay (December 18, 2023): “What Is Dandruff & How Is It Treated?” (summarizing the AAD)

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