Drill and scaler noise is a real hearing risk for dental professionals: 82% of studies in a 2023 systematic review linked dentistry with hearing loss, and 40% in a 2025 study reported tinnitus, though none rated it bothersome.
The risk is easy to underestimate, because no single sound in the office is as dramatically loud as a concert or a gunshot — it is cumulative, high-frequency, and spread across a decades-long career.
Why dental noise is a risk without one dramatic moment
The instruments are louder than their reputation. Measurements summarised in a 2025 study of dental professionals put high-speed handpieces at 98 to 102 dB SPL and ultrasonic scalers at 92 to 98 dB SPL in one study, and a turbine cutting tooth at 91.2 dBA in another. NIOSH's recommended exposure limit is 85 dBA averaged over an eight-hour workday. The noise comes in bursts across a working day rather than as one continuous exposure, which is why it rarely feels dangerous — but repeated daily exposure over a career adds up, following the same cumulative mechanism as any other noise-induced tinnitus. Ultrasonic scalers, used heavily by hygienists, add a second exposure source, often at frequencies that fall in the higher-pitched range associated with early noise-induced hearing changes.
What makes dental noise particularly relevant to tinnitus specifically: the exposure is high-frequency-weighted, and high-frequency hearing loss is the pattern most strongly associated with tinnitus onset (see the article on tinnitus and hearing loss) — meaning dental professionals' noise exposure profile lines up closely with the frequency range where tinnitus-related damage tends to start.
What was measured in dental professionals
A 2025 study tested the hearing of 60 dental professionals and compared their thresholds with international age- and sex-based reference ranges (ISO 7029:2017). 15–25% of men and 13–18% of women had thresholds beyond the 95th percentile of those norms, against the 5% the norms themselves would lead you to expect. Tinnitus, intermittent or constant, was reported by 40% of participants. None of them, though, rated it as bothersome on the Tinnitus Handicap Inventory, one of the standard tinnitus questionnaires. The study is small and had no comparison group of its own, so it cannot say how much of that tinnitus the work caused, but its authors call for greater awareness of occupational noise in dentistry and for routine hearing monitoring.
What the pooled evidence shows, including which ear
A 2023 systematic review in Occupational Medicine gathered the studies on hearing loss in dental professionals, 17 of 416 screened, and it settles the basic question: 82% of the included studies found a positive association with hearing loss for dentists and dental specialists. Dental hygienists and dental assistants were studied less often, so the evidence is thinnest for those roles.
Years of clinical experience came out as the prominent risk factor, which is what you would expect from cumulative exposure and is the reason this matters more at fifty than at thirty.
The detail worth knowing, and the one that makes the mechanism concrete: 71% of the studies found a difference between the left and right ears, with the left ear more affected — in both dentists and dental assistants. The review attributes it to proximity to the noise-producing equipment.
That asymmetry is a useful thing to carry, for two opposite reasons.
It supports the occupational explanation. A left-biased pattern is hard to explain by age or general noise exposure, both of which affect the ears roughly equally, and easy to explain by a handpiece that spends its working life closer to one side of your head.
And it should not be used to explain away one-sided symptoms. Asymmetric hearing loss or one-sided tinnitus meets the criterion for imaging, because that is the pattern a retrocochlear problem produces. Having an occupational reason for left-sided loss does not remove the need to have it assessed properly — it means you have a plausible explanation, not a confirmed one.
The review's own conclusion is that dental professionals are at risk and that this highlights the need for prevention and appropriate ear protection, which is the subject of the next section.
Why hearing protection is rarely used in dentistry — and what to do instead
Standard hearing protection (earplugs, earmuffs) is impractical in dental work — it interferes with hearing patients, communicating with staff, and picking up on the subtle auditory feedback some procedures rely on. This is part of why dental noise exposure is often overlooked entirely rather than actively managed, unlike more obviously loud occupations where hearing protection is the default expectation.
Practical alternatives that don't block communication:
- Equipment maintenance — well-maintained, properly lubricated handpieces run quieter than poorly maintained ones; noise level is worth factoring into equipment purchasing and servicing decisions, not just performance
- Newer, quieter equipment models, where budget allows — handpiece and scaler noise output varies meaningfully between models and manufacturers
- Limiting concurrent noise sources — suction equipment, music, and multiple simultaneous procedures in an open floor plan all add to total daily exposure; being deliberate about not stacking unnecessary noise on top of unavoidable procedural noise helps
- Regular hearing checks, ideally with a baseline audiogram early in a dental career and periodic monitoring after — this is standard practice in more obviously loud occupations and reasonable to adopt in dentistry given the cumulative exposure pattern, even without an OSHA mandate specifically targeting the profession. Ask for a copy each time; how to read your audiogram explains what to compare between tests