How many times can single-use or disposable implements be used on a client before being discarded?

Single-use or disposable implements are specifically designed for one-time use, meaning they should only be used once on a client before being discarded. This practice is essential for maintaining hygiene and preventing the transmission of infections or diseases between clients. Using these implements more than once, as implied by other choices, could lead to cross-contamination and compromise the safety and health standards within a nail salon or spa environment. Therefore, the correct answer emphasizes the strict guideline that such items must be discarded immediately after their single use to ensure client safety and compliance with health regulations.