A surprising number of "toothaches" don't come from a tooth at all. Sinus infections, jaw joint disorders, nerve conditions, migraines, and even cardiac events can refer pain into your teeth. A specialist endodontist's first job is to figure out whether the pain is actually endodontic — and to send you elsewhere when it isn't.
Medically reviewed by Dr. Jason Kung, DDS, MS · Specialist Endodontist · UCLA DDS · OHSU MS ·
Each of the following can produce pain that feels exactly like a problem tooth. The clues that distinguish them are often in the pattern — where the pain is, what triggers it, what calms it, and how the tooth itself responds to clinical testing.
Maxillary Sinusitis
Sinus infection
The roots of your upper back teeth — the molars and premolars — sit just below the floor of the maxillary sinus. When the sinus is inflamed, the pressure refers pain into multiple upper teeth on the same side, and they may all feel tender to bite.
Tells that point to this — not a tooth
Pain in two or more upper back teeth, not a single tooth
Worse when bending forward, lying down, or jumping
Recent cold, allergies, or sinus pressure
Teeth respond normally to cold testing
Who treats it: Primary care physician or ENT — usually decongestants or antibiotics if bacterial.
TMJ & Myofascial Pain
Jaw joint / muscle pain
The temporomandibular joint and the muscles that move your jaw can produce pain that feels like it's coming from a tooth, especially the upper or lower molars. Clenching and grinding (bruxism) at night is the most common driver.
Tells that point to this — not a tooth
Pain in front of the ear, in the temple, or along the cheek
Worse in the morning or after a stressful day
Jaw clicking, popping, or limited opening
Tooth feels normal to cold and percussion testing
Multiple teeth feel sore, not one
Who treats it: Your general dentist — typically a custom night guard, physical therapy, or referral to a TMJ specialist.
Trigeminal Neuralgia
Cranial nerve pain
A neurologic condition affecting the trigeminal nerve — the major nerve that supplies sensation to the face. Patients describe sudden, electric-shock or stabbing pain that lasts seconds at a time and is triggered by light touch, eating, or even a breeze.
Tells that point to this — not a tooth
Brief, lightning-like attacks of pain (seconds, not minutes)
Triggered by touching the face, brushing teeth, or eating
Pain follows a nerve distribution rather than one tooth
Patient is typically over 50
Cold testing on the suspect tooth is normal
Who treats it: Neurologist — first-line treatment is medication (commonly carbamazepine), not dental.
Atypical Odontalgia
Persistent dental pain disorder
A chronic, neuropathic pain that feels exactly like a toothache but has no detectable dental cause. Often follows previous dental work — including a root canal that was clinically successful. The nerve pathway itself becomes the source of the pain rather than the tooth.
Tells that point to this — not a tooth
Constant, dull or burning pain in or around a tooth
Pain has lasted longer than 3 months
Multiple dental procedures have failed to resolve it
All clinical and imaging findings are normal
Pain doesn't fit the pattern of any specific tooth
Who treats it: Orofacial pain specialist or neurologist — often medications targeting nerve pain (gabapentin, tricyclic antidepressants) and behavioral therapy.
Cardiac Referred Pain
Heart-related jaw pain
In rare but important cases, cardiac ischemia — including a heart attack — can refer pain to the lower jaw or teeth, especially in women, older adults, and people with diabetes. The teeth themselves are healthy.
Tells that point to this — not a tooth
Pain is in the lower jaw, often both sides or unclear which tooth
Brought on by physical exertion, relieved by rest
Associated with chest pressure, shortness of breath, sweating, or arm pain
Pain is not affected by hot, cold, or biting
Who treats it: Emergency medicine — call 911 if there is any concern for a cardiac event.
Migraine & Cluster Headache
Primary headache disorders
Certain migraine and cluster headache patterns can refer pain into the upper jaw and teeth. Cluster headache in particular causes severe one-sided pain around the eye and upper teeth.
Tells that point to this — not a tooth
Severe one-sided pain centered around the eye, temple, or upper teeth
Comes in episodes — minutes to hours, often at the same time of day
Tearing, nasal congestion, or eyelid drooping on the same side
Cold testing on the suspect tooth is normal
Who treats it: Neurologist or headache specialist — abortive and preventive medications.
How we rule out a non-dental source
Before recommending any irreversible treatment, the specialist endodontist's responsibility is to confirm the pain is endodontic. The process is structured.
01
We test the actual tooth
Cold testing tells us whether the nerve inside the tooth is alive and how it is responding. A tooth that responds normally to cold and isn't tender to percussion is very unlikely to be the source of significant pain.
02
We map the pain
Where exactly does it hurt? When did it start? What makes it better or worse? Does it follow a nerve distribution or stay confined to one tooth? The pattern often points clearly to or away from a dental cause.
03
We image carefully
Two-dimensional X-rays and, when needed, CBCT 3D imaging let us see the structures around the tooth. If the bone is healthy and the tooth looks normal, we look elsewhere.
04
We refer when appropriate
If the source isn't dental, doing a root canal won't fix it — and may make things worse. We will tell you that directly and refer you to the right specialist: ENT, neurologist, orofacial pain specialist, or your physician.
Worth knowing: the diagnostic protocol described here is consistent with standard endodontic teaching, including the differential diagnosis chapters in textbooks such as Worth knowing: the diagnostic protocol described here is consistent with standard endodontic teaching, including the differential diagnosis chapters in textbooks such as Endodontics Review: A Study Guide (Blicher, Lucier Pryles & Lin, Quintessence, 2016) and the AAE Endodontic Diagnosis position statement.
Not sure if you actually need a root canal?
That's exactly the right question to ask. A consultation with a specialist endodontist — including the proper diagnostic tests and imaging — can confirm whether the pain is endodontic or whether you should be seeing a different specialist instead. Either answer saves you from the wrong treatment.
Endodontic diagnosis — serving 30+ Bay Area cities
Dr. Jason Kung provides endodontic diagnosis to patients across Silicon Valley from our Sunnyvale office. Evening and weekend hours, same-day emergencies, free on-site parking.
