Rhode Island Cosmetology and Barbering Practice Exam

The ideal pH range for hair care products is between 4.5 and 5.5. This range is close to the natural pH of hair and the scalp, which typically falls within this range. Keeping products in this pH range helps maintain the hair's outer layer, the cuticle, in a healthy state, preventing it from becoming too rough or damaged. When hair care products are too alkaline (having a higher pH), they can raise the cuticle scales, leading to frizz, tangling, and increased susceptibility to damage. Products formulated with a pH within the 4.5 to 5.5 range help to strengthen the hair, improve moisture retention, and enhance overall manageability. Additionally, this pH range supports the scalp's health by maintaining its natural barrier, which can help prevent issues such as dryness or irritation.