Razor type callus shavers (credo blades) can be used by whom?

• A. No one
• B. Licensed cosmetologists
• C. Medical professionals
• D. Clients

Answer: (A)

Razor-type callus shavers use sharp blades to remove hard skin, but they carry a real risk of causing deeper cuts, infections, and cross-contamination if not used with exact technique and sterile conditions. Because of that safety concern, many licensing rules tightly limit who may use these tools. In the context of this question, the safest, regulation-aligned stance is that none of the listed groups should be using them in typical salon or client-care settings. Safer alternatives or use in a properly controlled medical setting under strict supervision and with appropriate training and sterilization are the routes allowed by some jurisdictions, but not standard use by clients, untrained individuals, or typical cosmetology professionals.