Disinfection, Infection Control & Safety
Disinfection and infection control make up the single largest block of the California esthetician written exam, roughly 30 percent of the questions, and they are also the area that generates the most inspection citations and the most client harm. The Board's health and safety regulations are written around one core idea: nothing that touches one client's skin may reach another client without being either discarded or properly cleaned and disinfected. This chapter covers the three levels of decontamination, what an acceptable disinfectant is, how porous and non-porous items differ, what to do when blood appears, and the daily habits that keep an establishment compliant.
Cleaning, Disinfection, and Sterilization Are Three Different Things
Cleaning removes visible soil, oil, and debris with soap and water and mechanically reduces the number of organisms present, but it does not kill them. Disinfection uses a chemical agent to destroy most pathogenic organisms on a hard, non-porous surface, though it does not reliably kill bacterial spores. Sterilization destroys all microbial life including spores and is the standard used in surgical settings. Estheticians are required to clean and then disinfect, in that order, because disinfectant cannot penetrate a film of oil or makeup. Sterilization is not required in esthetic practice because estheticians do not penetrate living tissue, and any procedure that would require sterile instruments is by definition outside the scope of the license.
Choosing and Maintaining the Disinfectant
Not every product that smells strong is a disinfectant. The Board requires an EPA-registered, hospital-grade product labeled bactericidal, fungicidal, and virucidal, and a product with an HIV and HBV kill claim is required whenever blood may be involved. Registration and the kill claims are only valid when the product is mixed at the exact label dilution and used exactly as directed, which is why measuring is not optional. Solutions become weaker as rinse water and skin debris are carried in, so they must be replaced on the manufacturer's schedule and immediately if they become cloudy or visibly contaminated. Topping off a used container with fresh concentrate does not restore its strength. Isopropyl alcohol is useful as a surface antiseptic but evaporates too quickly to hold a contact time and is not an accepted implement disinfectant.
Porous vs. Non-Porous: What Gets Thrown Away
The porosity of an item decides its fate. Non-porous items such as stainless steel tweezers, comedone extractors, glass electrodes, metal bowls, and hard plastic tools have a sealed surface, so a disinfectant can reach every part of them and they may be reused indefinitely. Porous items absorb liquid into their structure, so no amount of soaking will guarantee that organisms deep inside are killed. Wooden spatulas, cotton pads, gauze, sponges, paper wax strips, and disposable applicators are single-use and go into a covered, lined waste container after one client. The wax pot is where this rule is most often broken: once an applicator has touched skin, it is contaminated, and returning it to the pot contaminates the product for every client who follows. Wax is nowhere near hot enough to kill pathogens, and no client can consent away the rule because the risk falls on everyone else.
Blood Exposure, Standard Precautions, and Disease Transmission
Estheticians work under standard precautions, meaning every client's blood and body fluids are treated as potentially infectious, because carriers of hepatitis B, hepatitis C, and HIV are often asymptomatic and may not know their own status. Hepatitis B is especially relevant because the virus can remain infectious on a contaminated surface, which is why the HBV kill claim matters on a disinfectant label. Transmission is described as direct, when it passes person to person, or indirect, when it travels by way of a contaminated object such as a reused makeup brush, an unwashed implement, or a shared linen. If a client bleeds during an extraction, the service stops: put on gloves, apply pressure with clean cotton, bag the contaminated single-use items, and clean and disinfect the work surface and any non-porous implement with a hospital-grade disinfectant carrying an HIV and HBV claim. An esthetician with an open cut on her own hand must keep it covered with a bandage and a glove or finger cot for every service.
The Establishment: Linens, Ventilation, Chemicals, and Prohibited Practices
Compliance extends past the implement tray. Towels, sheets, and headbands are used once per client, then placed in a closed container for soiled linens and laundered before reuse, with clean linens kept in a separate closed cabinet. Chemical products must keep their original labels and have a Safety Data Sheet available describing hazards, handling, storage, first aid, and disposal, and vapors are controlled with ventilation, closed containers, and the personal protective equipment the SDS specifies. Equipment such as facial steamers is cleaned and descaled per the manufacturer's directions and filled with distilled water so it does not spit hot water on a client. Certain practices are simply prohibited in the area where services are performed, including keeping animals other than service animals and preparing or eating food. Finally, an active infection on a client, such as a weeping cold sore, an undiagnosed spreading rash, or a warm swollen area draining pus, is a contraindication: decline the service, refer the client to a physician without diagnosing, and disinfect anything the client contacted.
Last updated: July 2026