Which of the following tools requires sanitation after each client use?

The reason why scissors require sanitation after each client use is largely due to their direct contact with hair and potentially various contaminants such as hair products, sweat, and skin cells. Scissors are often used to trim or cut hair, and any buildup or residue left on the blades can pose a risk of cross-contamination between clients if not properly sanitized.

Sanitation of tools like scissors typically involves cleaning with disinfectants that are effective against a broad range of pathogens, including bacteria and viruses. This practice is essential in maintaining a hygienic environment and ensuring the safety of clients, which is a critical aspect of esthetics and personal services.

In contrast, styling chairs, mirrors, and walls generally do not require the same level of sanitation after each use because they do not come into direct contact with hair or skin in the same manner that scissors do. While they should also be cleaned regularly, the specific risk level associated with them does not necessitate immediate sanitation between clients.