Hair build-up test is a procedure used to determine the amount of product residue, dirt, and oil that has accumulated on the hair and scalp. The test is performed by applying a clarifying shampoo to the hair and scalp, and then rinsing the hair thoroughly. The amount of residue that is removed from the hair is then measured to determine the level of build-up.
Hair build-up can be caused by a variety of factors, including the use of styling products, environmental pollutants, and hard water. Build-up can make hair look dull, lifeless, and weighed down. It can also lead to scalp irritation and dandruff.





