Missouri Board of Cosmetology Practice Exam

The pH range of hair and skin is typically between 4.5 and 5.5, which aligns perfectly with the answer provided. This range is considered to be slightly acidic, which is important for maintaining the health of the hair and skin.

The skin has a natural protective barrier known as the acid mantle, which helps to preserve moisture and protect against bacterial growth. Maintaining a pH within this range supports this barrier, keeping the skin healthy and reducing the risk of irritation or infection.

For hair, the slightly acidic pH helps to keep the cuticle layer flat, promoting shine and manageability while minimizing damage. Products that fall outside this pH range can lead to issues such as dryness or frizz for hair, and sensitivity or irritation for skin.

Understanding this pH range is crucial for anyone in the cosmetology field, as it informs the selection and application of various hair and skin care products.