If you’re dealing with an itchy, flaky, or smelly scalp, it might be time to reevaluate your hair washing technique. The way you wash your hair plays a crucial role in maintaining scalp and hair health.
Dermatologist Dr. Hwang Sung-soo from South Korea shared his hair care routine on a TV show, emphasizing that keeping hair and scalp clean is key to preventing hair loss. Despite having a full head of thick, shiny hair, Dr. Hwang revealed a family history of hair loss. In his 20s, he started experiencing hair loss himself.
Dr. Hwang discovered an effective hair washing method that restored his hair’s volume and health. He often shares his unique hair washing technique, dubbed the “2.2.2 method,” which nourishes the scalp and creates an optimal environment for hair growth.

Dr. Hwang’s effective hair washing method
What is the “2.2.2 method”?
Step 1: Mix shampoo with water and lather in your palms. Apply the foam to your scalp and leave it on for at least two minutes.
Step 2: Rinse your scalp and hair with warm water for about two minutes to ensure all the shampoo and dirt are washed away.
Step 3: Gently squeeze out excess water from your hair, then use a towel to blot your hair and scalp for about two minutes. Avoid pulling or twisting your hair when removing the water.
Common Mistakes in Hair Washing
To maintain a healthy scalp and hair, it’s essential to avoid the following three common mistakes in addition to practicing the “2.2.2 method”
– Applying shampoo directly to the scalp: It’s important to first mix the shampoo with water and create a lather before applying it to your hair. This not only enhances the effectiveness of the shampoo but also ensures a gentle cleanse.
– Washing hair with hot water: While a hot shower may feel comforting during winter, extremely high water temperatures can accelerate scalp aging and cause irritation. Warm water is ideal, as it dissolves dirt, opens up the hair cuticles, and ensures shampoo penetrates each hair strand.
– Scratching your scalp with your nails: Some people may have the habit of using their nails to scratch their scalp while washing, believing it helps remove dirt and excess oil. However, this can cause scratches on the sensitive scalp and lead to infections. Instead, use your fingertips to gently massage and clean your scalp during the washing process.
In addition to avoiding these three mistakes, it’s crucial to blow-dry your hair after washing. Many people skip this step out of convenience, but leaving your hair damp can be detrimental to scalp health. High temperatures and humidity create an ideal environment for bacterial growth, potentially causing an unpleasant scalp odor. Therefore, always use a hairdryer after washing to keep your scalp dry and healthy. Hold the dryer about 10 to 15 cm away from your scalp and adjust the heat setting to avoid excessive heat, as this can damage your hair cuticles.
Once your hair and scalp are about 70-80% dry, you can switch to the cold air setting to help seal the hair cuticles.
Lastly, don’t forget to apply a hair care product after drying to complete your styling and provide moisture, leaving your hair soft and shiny.

Using nails to scratch the scalp is a common habit, but it can cause scratches and potential infections.
How Often Should You Wash Your Hair?
The ideal hair washing frequency is a subject of debate, with varying opinions. Some suggest avoiding daily washing, while others recommend it. In reality, the best way to determine your washing frequency is by considering your scalp’s oiliness.
– Dry scalp: Wash every 2-3 days.
– Normal scalp: Wash every 1-2 days.
– Oily scalp: Wash daily.
As for whether to shampoo twice in one washing session, it depends on your scalp’s oiliness and the amount of dirt accumulated during the day. There’s no need to shampoo twice every time.
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