When should tools that are meant to be single-use be disposed of?

Tools that are designed for single-use should be disposed of after each use to ensure the highest level of sanitation and to prevent cross-contamination. Single-use items are typically sterile and meant to be used only once to maintain the integrity of hygiene practices. Using these tools more than once could introduce bacteria or other pathogens, posing a risk to clients' health and safety.

In the context of the choices provided, relying on single-use items means their effectiveness is guaranteed only until they have been used once. Therefore, proper disposal after each use is necessary to uphold sanitation standards in any esthetic practice.