What should you check before using a hair product on a client?

Before using a hair product on a client, it is essential to check the product's expiration date. This is crucial because expired products may contain ingredients that have broken down or become less effective over time, potentially leading to undesirable effects when applied to the hair or scalp. Using expired products can also pose safety risks, such as allergic reactions or irritation, since the chemical stability of the product can no longer be guaranteed.

While factors like the product's fragrance, the client's hair type, and the product's viscosity are important considerations when selecting the right product for a client, they do not directly impact the safety and effectiveness of the product as much as the expiration date does. Ensuring that products are within their usable timeframe is a foundational part of client safety and care in a barbershop or salon environment.