"Usually, a person only needs to wash their hair once and use conditioner to maintain hair cleanliness. However, there are some people who wash their hair twice and use conditioner twice as well. They do this hoping to achieve better results. But, is this appropriate according to dermatological views?"

The need to wash hair twice or double depends on several factors, including hair type, activity level, and personal care needs. Generally, washing hair twice can help remove oil buildup, dirt, sweat, and product residue on the scalp and hair. This practice can also help cleanse the scalp from dead skin cells, microorganisms, and unwanted odors. Therefore, washing hair twice is very beneficial for those with curly and coarse hair, oily scalp, or anyone who does not wash their hair for several days.

However, there is also the potential for loss with the double hair washing method. Washing hair twice a day or every other day can remove too much oil from the scalp and hair, making the hair more susceptible to damage and brittleness due to heat. For people with sensitive skin, washing hair twice can cause dryness, dandruff, or flaking.

Although washing hair twice aims to clean dirt and oil from the hair and scalp, using conditioner twice may not yield the same results. In fact, using conditioner twice may reduce the benefits of washing hair twice. It is recommended not to use conditioner more than once. It is better to use conditioner once and let it penetrate for 3 to 5 minutes.

In the matter of washing hair, there is no approach that can be universally or specifically applied. The best way depends on several factors such as the level of oil on the scalp, hair dryness, hair type, hair style, and other variables that can vary for each individual. Additionally, the frequency of washing hair also needs to be adjusted to one's lifestyle and daily activity level.