Which of the following is an example of a single-use disposable item?

• A. Jars
• B. Sponges
• C. Pumice stone
• D. Nail file

Answer: (C)

Single-use disposable items are those that cannot be reliably disinfected to a safe level and must be discarded after one client to prevent cross-contamination. A pumice stone fits this rule because its rough, porous surface makes thorough cleaning and disinfection extremely difficult; pathogens can hide in tiny pores and microcrevices, so the safest practice is to replace it after each use. By contrast, jars and other nonporous items can be cleaned and disinfected between clients and reused. Sponges and similar items may be disinfected or replaced according to protocol, but they’re not inherently single-use like a pumice stone.