Pacemaker and Dental Treatment: What You Need to Know

Most routine dental procedures are safe for people with pacemakers. A systematic review of both laboratory and clinical studies found that common dental devices, including electronic apex locators, ultrasonic instruments, and electric pulp testers, did not meaningfully disrupt pacemaker function when used at normal clinical distances and standard sensitivity settings.¹ That said, the story is more layered than “everything is fine.” Certain tools, certain device configurations, and certain medical circumstances all shift the calculus, and knowing which ones matter can make the difference between an uneventful cleaning and a genuinely stressful situation.

Why Dental Equipment Raises Concerns in the First Place

Pacemakers work by sensing the heart’s electrical signals and delivering precisely timed pulses to keep it beating at a normal rhythm. Any external electrical or magnetic field strong enough to be picked up by the device’s sensing circuits can fool the pacemaker into thinking the heart is doing something it isn’t. If the device interprets external noise as a normal heartbeat, it may hold off on pacing when pacing is needed. In someone who relies entirely on the pacemaker to maintain a heartbeat, that pause could lead to dangerously low blood pressure, dizziness, or fainting.²

Dental offices contain several tools that generate electromagnetic fields: ultrasonic scalers vibrate at high frequencies to remove tarite, electrosurgical units cut tissue using electrical current, and devices like electronic apex locators send small currents through a tooth to measure root canal length. The question isn’t whether these tools produce electromagnetic energy; they do. The question is whether that energy is strong enough, at the distances encountered during actual dental care, to interfere with a pacemaker’s sensing circuits. The answer, for most instruments and most modern devices, is no.

Lab Results Versus What Happens in the Chair

Much of the worry about dental equipment and pacemakers comes from laboratory studies, which tend to test worst-case scenarios. In these experiments, dental instruments are placed within a few centimeters of the pacemaker generator or its leads, and device sensitivity is cranked up to its maximum setting. Under those artificial conditions, interference does show up. A study that tested several common dental tools against pacemakers and implantable defibrillators in a lab found that a battery-operated composite curing light inhibited pacing at distances of roughly 2 to 10 centimeters from the generator, and an ultrasonic scaler caused interference at various distances depending on the device type.³

Clinical studies, where the same kinds of instruments are used on actual patients in real dental settings, tell a consistently less alarming story. In the same study just mentioned, the researchers also tested equipment on patients with pacemakers and defibrillators in a clinical setting and found that electric toothbrushes, electrosurgical units, electric pulp testers, high-speed and low-speed handpieces, and an amalgamator did not alter pacing function at all.³ A separate clinical trial tested 32 patients with pacemakers or defibrillators and found no significant clinical interference with any dental device, though the telemetry readout from the cardiac programmer did pick up minor, clinically irrelevant noise during ultrasonic scaler use.⁴

The gap between lab and clinical findings makes sense once you understand why. In a real dental procedure, the working tip of an instrument is inside the mouth, usually well over 15 centimeters from the pacemaker generator sitting under the collarbone. Lab setups eliminate that distance. They also tend to use the most sensitive pacemaker settings, while real devices are typically programmed to filter out more background noise. When dental equipment was tested at a clinically realistic distance of about 20 centimeters, it provoked only slight interference regardless of the pacemaker’s manufacturer.⁵

Specific Tools and Their Track Record

Not all dental instruments carry the same theoretical risk. Here is what the clinical evidence says about the categories that come up most often.

Electronic Apex Locators and Pulp Testers

These two devices are among the most thoroughly tested. Electronic apex locators send a tiny current through a tooth’s root canal to help measure its length, while electric pulp testers apply a small current to the tooth surface to check whether the nerve is alive. Both produce only very low-level electromagnetic output. A study of patients with implanted pacemakers and defibrillators found that neither apex locators nor an electric pulp tester caused any interference with any of the cardiac devices tested.⁶ An increase in pacing rate was observed in a few patients during the test, but careful analysis of the heart rhythm tracings showed this was caused by a natural slowing of the patient’s own heartbeat during the procedure, not by electrical interference. The pacemaker simply did its job and paced more when the heart slowed slightly. A separate study confirmed that three different electronic apex locators produced no pacing interference at all and that an electric pulp tester generated some minor background noise on the monitoring tracing without disrupting the actual pacing pattern.⁷

Ultrasonic Scalers

Ultrasonic scalers use high-frequency vibrations to break up calculus deposits during cleanings. They produce a measurable electromagnetic field, and in lab testing these devices have shown the ability to interfere with pacemaker function at distances closer than about 15 to 23 centimeters from the generator, depending on the device model.³ In clinical settings, this has not translated into meaningful problems. One prospective study noted minor telemetry noise during ultrasonic scaler use but no actual change in pacemaker or defibrillator function.⁴ Still, ultrasonic scalers consistently emerge as the dental tool most likely to produce detectable electromagnetic output, so many cardiology guidelines recommend keeping the handpiece away from the pacemaker site and using the scaler in short bursts rather than continuously.

Drills, Curing Lights, and Other Standard Tools

High-speed and low-speed dental handpieces (drills), amalgamators, and electric toothbrushes have all been tested clinically without any effect on pacing function.³ LED curing lights, which have largely replaced older composite curing units, generate less electromagnetic output than the battery-operated halogen models that caused interference in older lab studies. If your dentist uses a modern LED curing light, the risk is essentially negligible.

Unipolar Versus Bipolar Sensing Matters

One technical detail worth knowing about your own device is whether it is programmed for unipolar or bipolar sensing. In unipolar mode, the pacemaker senses electrical signals between the lead tip inside the heart and the metal casing of the generator under the skin. Because those two points are far apart, the sensing antenna is essentially the entire length of the lead, which makes it more likely to pick up stray electromagnetic signals from the environment. In bipolar mode, the device senses between two closely spaced electrodes at the lead tip, creating a much smaller antenna that is far less susceptible to outside noise.

Experimental studies have confirmed this difference repeatedly. One study using external magnetic fields of various types found that unipolar configurations were more prone to interference than bipolar ones.⁸ A clinical study of pacemaker patients exposed to power-line-frequency magnetic fields found that all observed malfunctions occurred in devices programmed to unipolar sensing; no effect was seen in those set to bipolar sensing, aside from a single interaction involving a specific automated algorithm.⁹ Most modern pacemakers are programmed in bipolar mode by default, but not all. If you’ve never asked your cardiologist about this, it’s worth checking before scheduling anything beyond a basic exam.

Dental X-Rays and CT Scans

Standard dental X-rays, the small intraoral films taken during checkups, deliver a very low dose of radiation to a small area inside the mouth. The X-ray beam is nowhere near the pacemaker generator, and the energy levels involved are far too low to cause electromagnetic interference. Panoramic X-rays, which image the entire jaw, also pose no practical risk because the beam sweeps around the head and jaw, not over the chest.

CT scans are a different story. A laboratory study found that X-ray radiation from a CT scanner inhibited pacing pulses in four types of pacemakers when the scanner’s beam was directed at the pacemaker generator itself. The interference depended on the tube voltage, tube current, total radiation dose, and the direction of the X-ray beam relative to the device.¹⁰ This is relevant for cone-beam CT (CBCT) scans, which are increasingly used in dental offices for implant planning and complex root canal cases. In most CBCT setups, the radiation is confined to the head and jaw and the beam does not sweep across the chest. But if the scan field is large enough to include the upper chest, or if a medical CT of the head and neck is performed with the beam passing near the device, the risk becomes real. Dentists and radiology technicians should confirm the scan geometry avoids the pacemaker site.

Infection Risk and Endocarditis

Electromagnetic interference isn’t the only concern linking pacemakers and dental treatment. Dental procedures that cause bleeding, from a deep cleaning to a tooth extraction, briefly allow mouth bacteria to enter the bloodstream. In people with normal hearts, these transient episodes of bacteremia are cleared by the immune system without any trouble. In people with pacemaker leads threaded through the veins and into the heart, those leads offer a surface for bacteria to latch onto, and an infection on or around the leads can develop into a serious condition.¹¹

A large population-based study looked at infective endocarditis in patients with cardiac implantable electronic devices and found that device-related endocarditis occurred roughly 75 percent more often during periods following invasive dental procedures than during periods without dental procedures.¹² That is a meaningful increase in relative risk, though device-related endocarditis remains uncommon in absolute terms. Whether antibiotic prophylaxis before dental procedures is warranted for pacemaker patients is an area of active debate. Current American Heart Association guidelines do not list a pacemaker alone as an indication for prophylactic antibiotics, but some cardiologists and infectious disease specialists recommend them for patients with additional risk factors such as a prosthetic valve, a prior episode of endocarditis, or immunosuppression. Your cardiologist’s recommendation should take priority here.

Blood Thinners and Dental Surgery

Many people with pacemakers are also on anticoagulant medications, particularly those whose pacemaker was placed because of atrial fibrillation or another arrhythmia that raises stroke risk. Warfarin, direct oral anticoagulants like apixaban or rivarelbán, and antiplatelet drugs all affect how quickly bleeding stops after a cut or extraction.

The good news is that most dental procedures, including simple extractions and minor oral surgery, can go ahead without stopping anticoagulants as long as your blood-thinning level is within a safe range. For patients on warfarin, a commonly used threshold is an INR of 3.5 or below on the day of the procedure.¹³ Stopping or reducing anticoagulants to make dental bleeding easier to control introduces its own danger, because the drug was prescribed to prevent a clot in the first place. Dentists can usually manage post-procedure bleeding with local measures such as pressure packs, absorbable sponges, and sutures rather than by altering your medication. If you’re on a blood thinner, the key step is having your INR or clotting status checked before the procedure and sharing the result with your dentist.

Local Anesthesia and Epinephrine

A persistent myth holds that dentists should avoid using local anesthetics containing epinephrine in pacemaker patients. The concern, in theory, is that epinephrine could trigger an arrhythmia or otherwise interact with the device. In practice, the concentrations of epinephrine used in dental cartridges are extremely small and are mostly absorbed locally rather than reaching the heart in any meaningful amount.

A study comparing patients who received epinephrine-containing local anesthesia during cardiac device implantation with those who received plain anesthesia found no difference in complication rates between the two groups. If anything, the epinephrine group trended toward fewer hematoma events, though the difference was not statistically significant.¹⁴ The epinephrine in dental anesthetics also has a practical benefit: it constricts blood vessels at the injection site, which reduces bleeding and extends the duration of numbness, both of which are especially helpful in patients taking anticoagulants. Most cardiology and dental anesthesia guidelines consider standard dental doses of epinephrine-containing local anesthetics safe for pacemaker patients.

What to Communicate Before Your Appointment

Knowing that most dental tools are clinically compatible with pacemakers is reassuring, but that knowledge works best when it flows between you, your cardiologist, and your dentist. A few concrete steps make a real difference.

Share your device card: The card your cardiologist gave you after implantation lists your device manufacturer, model, and programming details including whether it uses unipolar or bipolar sensing. Give your dentist a copy or take a photo on your phone.
Confirm your medication list: If you take warfarin or another anticoagulant, get a current INR or coagulation test before any procedure that involves cutting or extraction, and share the result with the dental team.
Ask about antibiotic prophylaxis: If your cardiologist has recommended antibiotics before dental work, remind the dental office when scheduling so the prescription is ready.
Flag pacemaker dependence: If your heart has no reliable rhythm of its own and you depend entirely on the pacemaker to keep it beating, tell both your dentist and cardiologist. Pacemaker-dependent patients carry a higher theoretical risk from any interference event, and some dental teams prefer to have cardiac monitoring equipment available during longer procedures.

From the dentist’s side, keeping electromagnetic sources as far from the pacemaker site as practically possible remains a sensible precaution even though clinical studies have been largely reassuring. Using instruments in short, intermittent bursts rather than continuous operation is another low-cost step that reduces cumulative exposure. For ultrasonic scalers, which produce the strongest electromagnetic fields of common dental tools, some practitioners substitute hand scaling for patients who express concern, though clinical data suggest this is more a matter of comfort than necessity.

When the Device Is a Defibrillator, Not Just a Pacemaker

Implantable cardioverter-defibrillators share many features with pacemakers but add a layer of complexity. In addition to pacing, an ICD continuously monitors for dangerously fast heart rhythms and delivers a high-energy shock to restore normal rhythm if one is detected. The concern with electromagnetic interference in ICD patients is twofold: the device might fail to pace properly, just as with a pacemaker, or it might misinterpret external electrical noise as a life-threatening arrhythmia and deliver an unnecessary shock. An inappropriate shock is painful and frightening, and repeated inappropriate shocks can damage the heart muscle.

Clinical studies testing dental equipment on ICD patients have found the same general pattern as with pacemakers: no clinically significant interference at normal working distances.⁴ In lab settings, ultrasonic scalers and older curing lights have triggered sensing anomalies in ICDs at close range.³ Some clinicians recommend temporarily reprogramming an ICD to deactivate its tachyarrhythmia detection before a lengthy dental procedure that involves ultrasonic instruments or electrosurgery. This has to be done by the cardiology team, and it means someone needs to be monitoring the patient’s heart rhythm externally while the ICD’s shock function is turned off. For routine cleanings and fillings, this step is generally unnecessary.

Electrosurgery in Oral and Maxillofacial Procedures

Most dental visits involve cleanings, fillings, or root canals, but some patients with pacemakers need more involved oral surgery, such as biopsy of an oral lesion, removal of impacted wisdom teeth, or periodontal flap surgery. These procedures sometimes use electrosurgical or electrocautery units that deliver much higher levels of electromagnetic energy than anything found in a routine dental operatory. Electrosurgical units are the one category of dental equipment that consistently draws caution from cardiology guidelines, even though clinical testing of at least one electrosurgical unit did not alter pacemaker function during in vivo testing.³

The standard precautionary approach for electrosurgery in pacemaker patients involves using bipolar electrosurgical instruments rather than monopolar ones when possible, because bipolar instruments confine the current between two tips of the instrument rather than sending it through the body to a grounding pad. When monopolar electrosurgery is unavoidable, placing the grounding pad as far from the pacemaker as feasible and using the lowest effective power setting reduces the chance of interference. For patients with ICDs, the shock function is often deactivated before the procedure and reactivated immediately afterward, with continuous external cardiac monitoring in the interim. These are precautions, not evidence that problems are likely, but in surgery the standard is to plan for the worst-case scenario rather than assume the best.