Tinnitus after dental work is uncommon, but case reports document it as part of sudden hearing loss after a procedure under local anaesthetic; brief ringing during drilling is more plausibly noise travelling through the jawbone. Noticing ringing after an appointment can be alarming enough to search for an explanation straight away, so it helps to know which pattern is which.
What has been documented
Case reports describe acute sensorineural hearing loss occurring after dental procedures performed under local anaesthesia — an uncommon phenomenon in dentistry, but a real one with enough documented cases to have been studied specifically. Surgery under spinal, epidural or general anaesthesia has its own, separate set of case reports. Sudden sensorineural hearing loss (SSHL), whatever its cause, may come with other symptoms besides the hearing loss: the report of the second case below lists tinnitus, dizziness, vertigo, a feeling of fullness in the ear, and headaches. In both published cases described here, tinnitus came with a drop in hearing rather than on its own.
Two published cases show what this looks like:
- A 66-year-old man had root canal treatment on an upper molar under local anaesthesia with articaine and epinephrine. He was seen four days later with tinnitus, a blocked sensation and hearing loss in the ear on the same side, plus impaired balance, all of which had developed after the treatment. The balance problem settled within 3 days, but a hearing test showed profound sensorineural hearing loss in that ear. After treatment including steroids given intravenously and by injection through the eardrum, his hearing improved and the tinnitus resolved. The authors conclude that sudden hearing loss is rare after dental treatment, and that awareness of it may prompt early referral and improve recovery.
- A 79-year-old man had vertigo and hearing loss in one ear after a tooth extraction under a local anaesthetic containing adrenaline (epinephrine). The report's summary dates the hearing loss to 2 days after the procedure; its case description says both began immediately afterwards. The vertigo settled by the next day. Treatment including vasodilators and high-dose oral steroids brought only a small improvement: his average hearing threshold in that ear improved from 48.75 to 45 dB (lower is better), which the authors say was not clinically meaningful. Over three years of follow-up it slowly worsened to 55 dB, and he reported tinnitus and brief dizziness.
Two distinct proposed mechanisms
The literature points to two separate, plausible explanations, and they're worth understanding as distinct because they suggest different things about risk.
Vascular spread of the anaesthetic. The head and neck region has extensive, interconnected vascular pathways. One proposed mechanism is that epinephrine — commonly combined with local anaesthetics in dental injections to reduce bleeding and prolong numbness — can, in rare cases, reach the internal auditory artery through these vascular connections, triggering local vascular spasm that temporarily disrupts blood flow to the inner ear. Since inner-ear tissue is highly sensitive to blood flow disruption, this offers a specific, biologically plausible route from a dental injection to an auditory symptom.
Direct mechanical noise exposure. Separately, and more mundanely, dental drills produce a high-pitched, high-intensity sound — and because the drill is in direct contact with the teeth and jaw during a procedure, that sound can transmit into the inner ear via bone conduction, bypassing the normal air-conduction pathway sound usually travels. This is a more mechanical explanation, closer in spirit to ordinary noise-induced tinnitus than to a drug reaction, and it doesn't require anything unusual about anaesthetic spread to explain a temporary ringing sensation during or immediately after a procedure. The same drill noise, repeated over a career, is an occupational issue for the people holding it — see dental professionals and hearing risk.
How rare, and how it tends to resolve
The clinical framing across the available case literature is consistent: sudden hearing loss after dental treatment is rare. That rarity is precisely why case reports exist — common side effects don't typically generate individual published case studies the way uncommon ones do. Awareness of the connection matters less because it's likely to happen to any given patient, and more because early recognition, if it does occur, allows for a prompt referral and evaluation, which the authors of both case reports suggest may improve recovery. The outcomes above show why that matters: the first man recovered, while the second improved only slightly and his hearing in that ear later declined.
Practical points
- A brief, mild ringing sensation during or right after a procedure, especially one involving drilling, is most plausibly the bone-conduction noise-exposure mechanism — similar in kind to brief ringing after any loud, close-proximity sound, and it would be expected to resolve on a similar short timeline
- Tinnitus that appears alongside dizziness, vertigo, ear fullness, or a noticeable drop in hearing after a dental procedure with local anaesthesia is a different, more specific pattern worth prompt medical attention — that combination is what's described in the SSHL case literature, not isolated ringing alone
- This is not a reason to avoid necessary dental care — the documented cases are rare enough that they represent an uncommon complication, not a common risk that should change ordinary dental decision-making
- If you have a personal or family history of sudden hearing loss or unusual reactions to local anaesthesia, mentioning that to your dentist beforehand is reasonable, low-cost context for them to have