Final answer:
Operator and specialist licenses should be displayed in a conspicuous area of a cosmetology establishment, such as near the entrance or waiting area. Hygienic practices are vital in nail salons to prevent infections, and safer nail products are marked as '3-free' or '5-free'.
Step-by-step explanation:
In a cosmetology establishment, operator licenses and/or specialist licenses should be displayed in a noticeable location where clients can easily view them. This is typically near the entrance or within the waiting area of the salon. Such visibility ensures the credentials of the staff are transparent to clients, instilling confidence in the professional services provided. Hygienic practices in nail salons are crucial to reduce the risk of infections and typically include sterilization of tools, use of disposable items where possible, and maintaining clean workstations. Some professional nail products contain chemicals like formaldehyde, toluene, and dibutyl phthalate (DBP), which are potentially harmful. Safer alternatives often are labeled as "3-free" or "5-free," indicating the absence of these and other hazardous substances.