Star stylists have determined the correct frequency of shampooing based on hair type and structure. Their opinion is quoted by The Sun.
So, according to the general rule, if a person's hair is naturally dry or dyed, then they should be washed no more than twice a week, while owners of oily hair need to do this when necessary. In addition, in order to avoid drying out, it is not recommended to apply shampoo to the ends: they will rinse out naturally when the product is rinsed off.
According to Victoria's Secret colorist Shah Karegar, brunettes should also not wash their hair more than twice a week to avoid losing their natural shine.
"Washing your hair too often - every day or more often - will dry out your hair, not only because you remove healthy natural oils from it, but also because you will likely be drying it often with a hairdryer," said the stylist and founder of the care brand behind Justin Anderson's hair.
New York-based master Scott Miller added that excessive washing also stimulates the sebaceous glands to produce more fat. “You can only wash your hair for two days in a row if you had an intense workout in the gym or you visited a construction site where you were covered with dust,” he concluded.