What document must be available for every product kept in a salon to ensure health and safety?

The correct choice emphasizes the importance of having a Material Safety Data Sheet (MSDS) available for every product used in a salon. The MSDS provides comprehensive information on the properties of chemicals, including their hazards, handling instructions, storage requirements, and emergency measures in case of accidents.

This document is crucial in maintaining health and safety in the salon environment as it ensures that both the practitioners and clients are aware of potential risks associated with the products being used. By having access to MSDS, nail technicians can apply appropriate safety measures, such as using personal protective equipment, ensuring proper ventilation, and knowing how to respond in case of exposure or spills.

The MSDS serves as a vital resource for complying with health regulations and helps in promoting a safe working environment. In contrast, the other options may include general guidelines or protocols that do not provide the specific, detailed information that MSDS offers regarding individual products.