The pH scale is used to measure the acidity or alkalinity of a substance. The scale ranges from a pH of 0 up to a pH of 14. The lower the pH, the more acidic the solution is. Solutions with a higher pH are more alkaline.
Substances with a neutral, or balanced, pH fall in the middle of the scale with a pH value of 7. The more pH neutral shampoo is, the better it is for a person's hair. Shampoos with high pH levels open up the hair's cuticle, making it susceptible to damage.Learn more about Shampoo & Conditioner