What to Ask a Dental Sterilization Technician in an Interview
Questions by skill, the red flags, a practical task and a scoring rubric.
Ask a dental sterilization technician candidate to walk you through the work itself: how they clean and heat-sterilize instruments, how they run and record spore tests, how they keep up when the schedule is full, and what they do when a test comes back positive.
Those answers separate someone who has run a sterilization center from someone who has watched one.
Before the interview
Start with the paper you can check.
Our research found no state that requires a dental-office sterilization technician to hold a state license, registration or certification — Pennsylvania, New York and New Jersey certify central service technicians in health care facilities, but whether those laws reach dental offices was not verified, so confirm with your state dental board if your setting overlaps.
Ask for training certificates before the hour: in California, the employer must ensure an unlicensed dental assistant has completed an infection control course or exam before performing basic supportive dental procedures that could involve exposure to blood, saliva or other potentially infectious materials.
CDC's guidance is the one to hire against: cleaning, disinfection and sterilization of dental equipment should be assigned to dental health care personnel trained in the required reprocessing steps, with training that includes the PPE needed to handle contaminated equipment.
The interview exists to find out whether that training is real.
The full process is in how to hire a dental sterilization technician; posting language is in our job description template.
If you want to see the work, set the task up now: running a working interview covers the mechanics, skills assessments structured testing.
There is no sourced practical-test norm for this role, so design yours around your own center — and pay candidates for hours worked: in 2018 the U.S. Department of Labor found a Nashville dental practice violated federal minimum wage requirements by requiring candidates to do a "working interview" without paying them for those hours.
Scope the task to what your state's dental practice act lets an unlicensed trial participant do, and keep every question job-related — leave age, family, health, religion and immigration status out of your script.
Clinical and technical questions
Walk me through what happens to a tray of instruments from the operatory to the sterilization room, step by step.
What to listen for: A fixed sequence, named unprompted: transport out of the treatment area, cleaning first, packaging, the load, monitoring, storage.
CDC's guidance starts with cleaning — critical instruments are cleaned and heat-sterilized before each use.
An answer that starts with the sterilizer skips the step the guidance puts first.
Which items must be heat-sterilized, and which can be disinfected instead?
What to listen for: Heat named for critical items — anything that penetrates soft tissue or bone, such as surgical instruments and periodontal scalers — and for heat-tolerant semicritical items.
CDC says handpieces and their attachments, including low-speed motors and reusable prophylaxis angles, should always be heat-sterilized between patients, not just disinfected.
How do you monitor a sterilizer, and what does a week of testing look like?
What to listen for: Three indicators, not one: CDC recommends biological, mechanical and chemical monitoring together, with a biological indicator — a spore test — at least weekly, run with a matching control.
California goes further: 16 CCR 1005 requires weekly spore testing of every sterilizer, results documented and kept for 12 months.
A spore test comes back positive on Tuesday morning. What do you do before lunch?
What to listen for: Containment before retesting: sterilizer out of service, recent loads pulled, records in hand.
CDC says monitoring documentation helps determine whether an instrument recall is necessary — package labels carry the sterilizer used, the cycle or load number, the date and, if applicable, the expiration, so affected items can be retrieved.
"Run it again" leaves every load since the last good test unaccounted for.
The schedule is full and two operatories need turns at once. How do you keep sterilization from becoming the bottleneck?
What to listen for: A throughput habit, not a shrug: standardized kits, same-day trays prioritized, and a line nobody crosses — contaminated instruments never skip cleaning to save minutes.
Speed that arrives by dropping a reprocessing step is the answer that should end the interview.
Where do dental unit waterlines fit into your job?
What to listen for: Comfort with the unglamorous half of the role.
CDC says all dental units should use systems that treat water to meet drinking-water standards — 500 CFU/mL or less of heterotrophic water bacteria — and independent reservoirs alone are not sufficient.
A candidate who has never touched a waterline has never held the whole job.
Scope, license and compliance questions
What training do you have for this work, and what can you show for it?
What to listen for: Named courses with certificates, not job titles: infection control, OSHA bloodborne pathogens — and, if the role includes x-rays, whatever radiation credential your state requires.
In California, an unlicensed dental assistant may perform extraoral duties including sterilization and disinfection under a licensed dentist's general supervision, and may operate dental x-ray equipment only once the radiation safety course is complete.
What does OSHA's bloodborne pathogens standard expect from your training?
What to listen for: Elements, not vibes: an accessible copy of the standard, the epidemiology and symptoms of bloodborne diseases, modes of transmission, the employer's exposure control plan and how to get a copy, controls and PPE, hepatitis B vaccine information, the exposure-incident procedure — and interactive questions with the trainer.
"A video once" is what you fix in month one.
Who pays for your gloves and mask?
What to listen for: A compliance question dressed as a culture one: when there is occupational exposure, the employer must provide appropriate PPE — gloves, gowns, lab coats, face shields or masks and eye protection — at no cost to the employee.
A candidate who has been buying their own has worked somewhere with a problem.
How do you stay current on infection control after the first week?
What to listen for: A cadence: CDC recommends training during orientation, when new tasks or procedures are introduced, and at a minimum annually, with records kept per state and federal requirements.
A strong answer mentions their own file.
What do you know about immunizations and screening for dental staff?
What to listen for: Hepatitis B among the immunizations CDC recommends for dental health care personnel, and tuberculosis screening on hire for all dental health care personnel.
A missing record is an onboarding task, not a failure.
Where does your job end and the licensed clinicians' work begin?
What to listen for: A boundary stated with a state attached, because states write it differently.
In California, a basic dental assistant is unlicensed and may perform basic supportive dental procedures under a licensed dentist's supervision — extraoral sterilization and infection control tasks expressly included.
In Ohio, basic qualified personnel may perform the supportive services needed to maintain a hygienic practice environment, sterilizing included, under direct supervision.
Your state dental board owns the line.
Do you hold any certification in infection control or sterilization?
What to listen for: DANB's Certified in Dental Infection Prevention and Control (CDIPC), developed with the Association for Dental Safety — a single-exam certification DANB describes as the first clinically focused dental infection control certification in the United States.
A credential to weigh, not a legal gate.
States set their own bar: since September 14, 2026, an unlicensed dental assistant in California can satisfy the state's infection control requirement by passing DANB's Infection Control exam, a board-approved eight-hour course, or at least four hours of didactic plus two hours of lab — which may be online — from a CDA-, ADA CERP- or AGD PACE-approved provider.
Team and patient questions
Sterilization touches every chair. How do you keep the clinical team honest about returning instruments on time?
What to listen for: A process answer, not a personality answer: set pick-up times, a clean/soiled line nobody crosses, escalation when instruments come back late.
CDC recommends at least one trained infection prevention coordinator, responsible for written infection prevention policies and procedures — if that was them, they will say so; if not, they will name who it was.
Tell me about a time a clinician wanted a shortcut. What did you do?
What to listen for: A real example with a resolution: what they said, who they escalated to, whether the shortcut happened.
The strongest answers lean on the written policy rather than winning the argument; the worrying ones end with "I just did it their way."
How does your work reach the patient?
What to listen for: The chain said out loud: a properly reprocessed instrument is the reason the patient in chair two is safe.
Candidates who see the patient at the end of their work keep the logs; candidates who see only the sink do not.
A dentist hands you one contaminated instrument and asks you to rush it for the next patient. Walk me through that minute.
What to listen for: Speed within the sequence, never around it — the same steps compressed, not skipped, and honesty if the time does not exist.
The answer you cannot accept is the one where cleaning disappears under pressure.
Working interview or practical task
Hand the candidate a mock soiled tray and ask them to walk you through reprocessing it — a think-aloud, not a performance.
What to listen for: The order named unprompted — transport, cleaning, packaging, load, monitoring, storage — plus where PPE goes on and comes off.
Give them a blank sterilization log and a completed one from your office, and ask which fields matter and why.
What to listen for: Sterilizer used, cycle or load number, date of sterilization, expiration if applicable — the label fields CDC recommends — plus the pressure, temperature and exposure time from the gauges, displays or printouts that mechanical monitoring records.
The fastest way to see whether they have kept records themselves.
Set a timer and have them process one mock tray end to end at working speed, narrating as they go.
What to listen for: Where they speed up and where they refuse to: PPE changes, the cleaning step and the load records are where a professional holds the line.
A silent fast run says they can move; a narrated one says they know why.
Show them your spore-test kit and ask them to schedule a month of testing for your practice.
What to listen for: At least weekly with a matching control, logged with dates — and in California, documented and kept for 12 months.
Elsewhere, state your own rule and see whether they push back; a candidate who asks what your state requires thinks like an owner of the process.
Red flags
None of these is automatically disqualifying, but each deserves a follow-up question before you decide.
- Describes the job as "running the machine" — cleaning, packaging and monitoring never come up until you ask.
- Cannot walk through a single spore test they have run, logged or acted on.
- Would wipe down a handpiece between patients instead of heat-sterilizing it.
- Kept no sterilization records in a previous role, and cannot say who did.
- Speeds up by dropping the cleaning step when the schedule runs behind.
- Has no certificate or record for the infection control training they claim.
After the interview
Score everyone on the same scale while the interview is fresh — 1 to 5 on each dimension:
- Reprocessing sequence — 5: cleaning first, then packaging, load and storage, named unprompted. 1: the sterilizer is the whole answer.
- Monitoring and records — 5: biological, mechanical and chemical indicators, a weekly spore test with a control, logs that would survive a positive result. 1: "the light was green."
- Compliance knowledge — 5: the exposure control plan, employer-provided PPE, annual refresher training, described as things they have lived under. 1: training remembered as a video once.
- Speed under load — 5: compresses steps without dropping one. 1: drops steps, or freezes.
- Team behavior — 5: escalates by policy, sees the patient at the end of the work. 1: shortcuts on request, grievances instead of examples.
Decision rule: a 1 or 2 on reprocessing or on records is a stop — those are the dimensions you cannot retrain in a week.
Break ties on the practical-task narration and on the questions they asked about your setup.
Before the offer, close the loop: run your reference checks, and ask about the specifics the candidate gave you.
If the role also covers chairside duties, our dental assistant interview questions cover that half of the hire.
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