Waving, straightening, and hair lightening or coloring and all the service that permanently changed the hair are included as the chemical hair service. There are more than 200,000 licensed cosmetologists and more than 17,000 licensed barbers in the state in August 2004 in California. When you find your hair is not in the best condition, you should consider asking the operator to do a pretest. In this fact chemical hair care sheet you will find the different pretests.
