Sinus Tooth Pain: Causes, Symptoms, and How to Relieve It

Your teeth hurt — but your dentist says they look fine. Could it be your sinuses? A complete, dentist-reviewed guide for Canadians dealing with sinus infection tooth pain.

Quick Answer
Can a sinus infection cause tooth pain? Yes — and it is one of the most commonly misunderstood causes of dental discomfort. The maxillary sinuses sit directly above the roots of the upper back teeth. When they become inflamed and congested, the resulting pressure irritates nearby nerve endings and creates pain that feels exactly like a toothache. The teeth themselves are completely healthy; the source of the pain is above them. Treating the sinus infection — not the tooth — is what brings relief.

You wake up during cold and flu season with a dull, throbbing ache in your upper jaw. You run your tongue across your molars and wince. Convinced something is wrong with a tooth, you book an emergency dental appointment — only to be told your teeth look perfectly healthy. Sinus tooth pain is one of the most common reasons patients visit a dentist unnecessarily, and it is also frequently overlooked as the real culprit behind what seems like a stubborn toothache.

This guide explains exactly what causes sinus infection tooth pain, how to distinguish it from a genuine dental problem, how to relieve tooth pain from sinus pressure at home, and when it is time to seek professional help. Whether you are experiencing sinus pain in teeth on one side, unbearable pressure, or jaw aching when you are sick, you will find the answers here.

The Anatomy: Why Sinuses Affect Teeth

The Maxillary Sinus–Tooth Connection
You have four pairs of sinuses in your skull — the maxillary, frontal, ethmoid, and sphenoid sinuses. Of these, the maxillary sinuses are by far the most relevant to dental pain. They are the largest sinuses in the skull, located inside the cheekbones on either side of the nose. Critically, their floor sits directly above the roots of the upper molars and premolars, sometimes separated from those roots by only a thin layer of bone — or in some individuals, no bone at all.

When the maxillary sinuses are healthy, this proximity causes no problems. But when they become inflamed — due to a cold, flu, allergies, a bacterial infection, or structural issues — the following happens:

1. The sinus lining swells, reducing the space inside the cavity
2. Mucus accumulates and cannot drain properly
3. Pressure builds within the sinus cavity
4. That pressure pushes downward, compressing and irritating the nerve fibres that also supply the upper teeth
5. The brain interprets these nerve signals as tooth pain — even though the teeth are structurally intact

This phenomenon is known as referred pain — pain that is perceived in a location other than its true origin. The Canadian Dental Association (CDA) notes that pain originating from non-dental sources, including sinus inflammation, can closely mimic a toothache and sometimes lead to unnecessary dental procedures if the source is not correctly identified.

Why Only the Upper Teeth?
This is a question patients ask all the time. The answer is pure anatomy. The lower teeth are nowhere near any sinus cavity. Only the upper molars and premolars sit adjacent to the maxillary sinuses. This is why sinus infection teeth pain almost exclusively affects the upper back jaw. If you are experiencing lower tooth pain during a sinus infection, a dental cause is more likely.

Symptoms of Sinus Tooth Pain

Recognising the full symptom picture of dental sinus infection symptoms is the first step toward getting the right treatment. The most common signs include:

In the Teeth and Jaw

• A dull, deep, or pressure-like ache in the upper back teeth (molars and premolars)
• Pain that affects several adjacent teeth rather than a single tooth
• Teeth that feel sensitive to pressure or temperature without any visible dental problem
• A feeling that the teeth are sore, bruised, or "full"
• Jaw aching or tightness on one or both sides
• Pain that worsens when bending forward, lying down, or jumping

In the Face and Head

• Pressure or pain around the cheekbones, below the eyes, or across the forehead
• Headache, especially across the forehead or behind the eyes
• Facial tenderness when touched

Sinus and Systemic Symptoms

• Stuffy or runny nose, often with thick yellow or green mucus
• Postnasal drip (mucus running down the back of the throat)
• Reduced sense of smell or taste
• Low-grade fever or fatigue
• Symptoms that began or worsened with a recent cold or upper respiratory infection

The Position Test
One of the simplest ways to identify sinus tooth pain is to lean your head forward toward your knees, then straighten back up. If the pain in your teeth intensifies when bending forward and eases when you stand back up, this is a strong indicator that sinus pressure — not a dental problem — is responsible.

Sinus Pain vs. Dental Pain: How to Tell the Difference

Because the symptoms overlap so significantly, differentiating sinus pain in teeth from a genuine dental problem can be genuinely difficult — even for experienced clinicians. This side-by-side comparison covers the key distinguishing features.

Likely Sinus-Related Pain

• Multiple upper teeth ache at once
• Pain is dull, pressure-like, deep
• Worsens when bending forward
• Came on with a cold or congestion
• Stuffy nose or facial pressure present
• Affects one side of the upper jaw
• No single tooth is more painful than others
• Pain fluctuates with congestion levels

Likely Dental Pain

• One specific tooth hurts more than others
• Pain is sharp, throbbing, or electric
• Triggered by biting, hot, or cold
• No associated sinus or cold symptoms
• Visible swelling or gum redness nearby
• Toothache preceded facial pressure
• Sensitivity persists after stimulus removed
• Pain wakes you from sleep

When symptoms do not fit neatly into one category, or when a sinus infection and a dental problem coexist, professional evaluation is essential. Guessing which one it is — and treating only that — can leave the other condition unresolved and allow it to worsen.

Why Sinus Tooth Pain Often Affects Only One Side

Many patients notice that their sinus tooth pain is on one side only. This is entirely normal and reflects how sinus infections typically develop. Sinus infections frequently begin in just one maxillary sinus — particularly when a cold or nasal congestion affects one side more than the other, or when a structural issue such as a deviated nasal septum favours drainage problems on one side of the face.

Because each maxillary sinus sits above only the upper teeth on the same side of the face, inflammation in the left sinus causes pain in the upper left teeth, and vice versa. One-sided sinus tooth pain is therefore a useful diagnostic clue — it strongly suggests a sinus rather than dental origin, especially when accompanied by one-sided congestion or facial pressure on the same side.

One-Sided Pain That Spreads or Intensifies
If one-sided pain suddenly becomes severe, spreads to the eye, or is accompanied by swelling around the eye socket or high fever, seek immediate medical attention. These can be signs of a serious sinus complication that requires prompt treatment.

Why Do My Teeth Hurt When I'm Sick?

One of the most searched questions we see is: "Why do my teeth hurt when I'm sick?" The answer is almost always the same: sinus pressure.

When you catch a cold, flu, or upper respiratory infection, your immune system triggers inflammation in the nasal passages and sinuses as part of its response. The maxillary sinuses, already sitting close to your upper tooth roots, swell and fill with mucus. As drainage is blocked, pressure builds rapidly inside the sinus cavity. That pressure has nowhere to go but downward — directly into the nerve-rich area surrounding your upper molar roots.

Your trigeminal nerve, which supplies sensation to both your upper teeth and your sinuses, carries these pain signals to your brain. Because the nerve services both areas, your brain can struggle to pinpoint the origin, and you feel the pain as a toothache — even when the teeth are completely healthy.

The good news: teeth hurt sinus infection pain resolves entirely once the infection clears and the sinus pressure subsides. No dental treatment is needed.

When a Tooth Infection Causes a Sinus Problem (Odontogenic Sinusitis)

The relationship between teeth and sinuses is not one-directional. While sinus infections commonly cause tooth pain, a dental infection can also travel upward and trigger a sinus problem — a condition known as odontogenic sinusitis.

Research cited in the International Forum of Allergy & Rhinology suggests that more than 40% of one-sided maxillary sinus infections may have a dental origin. When an upper molar or premolar develops a deep infection, abscess, or fails following root canal treatment, bacteria can breach the thin bone floor of the maxillary sinus and cause inflammation there.

Signs That May Point to Odontogenic Sinusitis

• Chronic one-sided nasal congestion that does not respond to typical sinus treatments
• Foul-smelling nasal discharge on one side
• A history of dental work, root canals, or extractions on the upper back teeth
• A sinus infection that returns repeatedly despite antibiotic treatment
• Congestion that began around the same time as tooth pain or dental work

Important: Odontogenic sinusitis will not resolve on its own or with antibiotics alone. The underlying dental problem must be diagnosed and treated — typically by a dentist or oral surgeon — for the sinus infection to clear. If you have a persistent one-sided sinus infection and a history of upper tooth problems, ask your dentist to evaluate for an odontogenic source.

How to Relieve Tooth Pain from Sinus Pressure

If you are confident your tooth pain is sinus-related, the goal of treatment is to reduce sinus inflammation and encourage mucus drainage. Once pressure in the sinus decreases, the tooth pain typically resolves on its own. Here are the most effective at-home and medical approaches to sinus pain relief.

Stay Well-Hydrated

Drinking plenty of fluids — water, warm broths, herbal teas — helps thin mucus and promotes natural sinus drainage. Aim for at least 8 cups per day when you have a sinus infection.

Saline Nasal Rinse

A saline rinse (neti pot or squeeze bottle) flushes mucus directly from the nasal passages and sinuses, reducing congestion and pressure rapidly. Use distilled or previously boiled water for safety.

Steam Inhalation

Breathing in warm, moist air from a bowl of hot water or a hot shower loosens mucus and soothes inflamed sinus tissue. Add a few drops of eucalyptus oil for added benefit.

Warm Compress

Apply a warm, damp cloth to your cheeks and forehead for 10–15 minutes at a time. The warmth helps reduce facial pressure, improves local circulation, and can ease pain in the teeth and jaw.

Head Elevation

Sleep with your head elevated on two pillows. Lying flat allows mucus to pool in the sinus cavity, increasing pressure. Keeping your head raised encourages drainage and often reduces overnight tooth pain significantly.

OTC Decongestants

Products containing pseudoephedrine or phenylephrine reduce swelling in nasal tissue and improve drainage. Nasal decongestant sprays work faster but should not be used for more than 3 consecutive days to avoid rebound congestion.

OTC Pain Relievers

Ibuprofen (Advil, Motrin) is particularly effective because it is both a pain reliever and an anti-inflammatory. It can reduce both the tooth pain sensation and the sinus swelling driving it. Acetaminophen (Tylenol) helps with pain but not inflammation.

Spicy Foods

Horseradish, garlic, ginger, and chilli peppers can temporarily thin mucus and promote drainage. A warm bowl of spicy soup can provide noticeable short-term relief from sinus congestion and associated tooth pressure.

Nasal Steroid Sprays (Prescription & OTC)
For moderate to severe sinus inflammation, nasal corticosteroid sprays such as fluticasone (Flonase) or mometasone can significantly reduce sinus swelling and pressure. Some are available over the counter in Canada; others require a prescription. They take a few days to reach full effect but are one of the most effective tools for persistent sinus congestion.

Pressure Points for Sinus Pain in the Teeth

Facial acupressure is a traditional technique that some people find helpful for temporarily relieving sinus congestion and the associated sinus pain in teeth. While clinical evidence is limited, these points are safe to try and may offer short-term comfort between other treatments.

LI-20 — Beside the Nostrils
Place your index fingers in the crease beside each nostril. Apply gentle circular pressure for 1–2 minutes. This point is associated with nasal congestion and sinus drainage.

BL-2 — Inner Eyebrow Corners
Locate the inner corner of each eyebrow, where the brow meets the bridge of the nose. Apply gentle upward pressure with your thumbs for 1 minute. This point may relieve frontal sinus pressure.

ST-3 — Below the Cheekbones
Find the point directly below the pupil of your eye, at the lower edge of the cheekbone. Gentle downward circular pressure here targets the maxillary sinuses — the ones most responsible for tooth pain.

GV-24.5 — Third Eye Point
The point between the eyebrows, at the bridge of the nose. Apply steady, light pressure for 1–2 minutes. Often recommended for general sinus pressure relief and headache.

LI-4 — Hand Web
Pinch the fleshy area between your thumb and index finger on either hand. This is a traditional general pain-relief point that some patients find helpful during sinus-related tooth pain. Avoid during pregnancy.

Apply pressure firmly but gently — never to the point of bruising. These techniques are complementary and should not replace medical treatment for a confirmed sinus infection.

How to Relieve Jaw Pain from a Sinus Infection

Beyond tooth pain, many patients experience jaw pain from a sinus infection. This tends to occur for two reasons: the same referred pain mechanism that causes sinus tooth pain can radiate into the jawbone itself, and — separately — being unwell often causes people to unconsciously clench or grind their teeth, adding muscular tension to an already painful area.

Steps to Relieve Sinus-Related Jaw Pain

• Apply warmth: A warm compress or heating pad placed over the jaw and cheeks for 15 minutes several times a day helps relax tense jaw muscles and reduce referred sinus pain.
• Take anti-inflammatory medication: Ibuprofen addresses both the pain and the underlying sinus inflammation driving it — it is the preferred choice over acetaminophen for this type of pain.
• Eat soft foods: Avoid hard, crunchy, or chewy foods while your jaw is tender. Soup, yoghurt, smoothies, and cooked vegetables reduce mechanical stress on the jaw.
• Avoid clenching: Be mindful of jaw tension, especially at night. If you wake with a sore jaw, a night guard can be helpful — ask your dentist about this option.
• Treat the sinus infection: All jaw pain driven by sinus inflammation will resolve once the underlying infection clears. Focusing on sinus drainage and congestion relief is the most effective long-term approach.

If jaw pain persists after your sinus infection has resolved, it is worth visiting your dentist to evaluate for temporomandibular joint (TMJ) issues, which can produce very similar symptoms and may have been aggravated by the period of clenching during your illness.

Dealing with Unbearable Sinus Tooth Pain

For most people, sinus tooth pain is a dull inconvenience. But for some — particularly during a severe bacterial sinus infection or an acute flare of a chronic sinus condition — the pressure can become genuinely unbearable. Here is what to do if at-home measures are not providing adequate relief:

• Combine pain relief strategies: Use ibuprofen for inflammation and acetaminophen for pain together (alternating every few hours) for stronger combined effect. Always follow label dosing instructions.
• Use a nasal decongestant spray: A fast-acting spray such as oxymetazoline can provide rapid pressure relief within minutes — though it must not be used for more than 3 days continuously.
• See a doctor promptly: Severe or worsening pain despite home treatment warrants a medical visit. Bacterial sinusitis that requires antibiotics is the most common cause of intense sinus tooth pain that does not improve on its own.
• Rule out a dental emergency: Before assuming the pain is entirely sinus-related, it is important to rule out a dental abscess, cracked tooth, or other urgent dental condition that can produce equally severe pain. A dentist can perform a brief examination and take X-rays to confirm your teeth are not the source.

Seek Immediate Care If You Experience:
Swelling or redness around your eye, severe headache with stiff neck, high fever (above 39°C / 102°F), vision changes, difficulty opening your mouth, or tooth pain with visible swelling of the face or jaw. These symptoms can indicate a serious infection requiring urgent medical or dental attention.

When to See a Dentist or Doctor

Many cases of sinus tooth pain resolve on their own within 7–10 days as the underlying cold or sinus infection clears. However, there are situations where professional evaluation is important.

See a Dentist If:

• The pain is focused on one specific tooth and does not spread to neighbouring teeth
• The tooth is sensitive to hot or cold after the stimulus is removed
• You notice swelling, redness, or a bump near the gum line
• The tooth hurts when you bite down specifically on it
• Your pain persists or worsens even after your sinus congestion has cleared
• You are unsure whether the pain is sinus- or dental-related

See a Doctor If:

• Sinus symptoms (congestion, facial pressure, nasal discharge) have lasted more than 10 days without improvement
• You develop a fever above 38.5°C (101°F)
• Your mucus is thick, yellow, or green and is not improving
• You have recurrent sinus infections (three or more per year)
• OTC medications are not providing adequate relief

The CDA on Sinus-Related Tooth Pain
According to the Canadian Dental Association, pain from non-dental sources — including sinus infections — can be mistaken for a toothache. The CDA recommends consulting a dentist when tooth pain is severe, persistent, or accompanied by swelling, to ensure the correct diagnosis and avoid unnecessary treatment.

Frequently Asked Questions

Can a sinus infection cause tooth pain?

Yes — this is one of the most common and frequently misunderstood causes of upper tooth pain. The maxillary sinuses sit directly above the roots of the upper molars and premolars. When these sinuses become inflamed and congested, the resulting pressure irritates the nerve endings that also supply the upper teeth. Your brain interprets these nerve signals as tooth pain — even though the teeth are completely healthy.

According to the Canadian Dental Association, sinus inflammation is a recognised non-dental cause of referred tooth pain. Once the sinus infection resolves, the tooth pain disappears without any dental intervention.

How do I relieve tooth pain from sinus pressure at home?

The most effective at-home strategies focus on reducing sinus inflammation and encouraging mucus drainage. These include: staying well-hydrated, using a saline nasal rinse (neti pot), inhaling steam, applying a warm compress to the cheeks and forehead, sleeping with your head elevated, and taking OTC ibuprofen (which tackles both pain and inflammation). Nasal decongestants can provide additional relief but should not be used for more than 3 consecutive days.

If symptoms do not improve within 7–10 days, or if they are severe, consult a doctor or your dentist to rule out a bacterial infection requiring antibiotics, or a dental source for the pain.

Why do my teeth hurt when I'm sick?

When you have a cold, flu, or sinus infection, your maxillary sinuses become inflamed and fill with mucus. As drainage becomes blocked, pressure builds inside the sinus cavity and pushes down on the nerve fibres near the roots of your upper back teeth. Because the trigeminal nerve supplies sensation to both the sinuses and the upper teeth, your brain perceives this sinus pressure as tooth pain. The teeth are completely unaffected — the pain is entirely referred from the sinuses.

This is why your teeth hurt when you are sick but feel fine once you recover. No dental treatment is needed.

What are pressure points for sinus pain in the teeth?

Several facial acupressure points may offer temporary relief from sinus-related tooth pain by encouraging mucus drainage and reducing sinus pressure. Key points include: LI-20 (beside the nostrils), BL-2 (inner corners of the eyebrows), ST-3 (below the cheekbones, directly below the pupil), and GV-24.5 (between the eyebrows). Apply gentle circular pressure for 1–2 minutes at each point.

These techniques are safe to try alongside other sinus relief methods, though they are complementary rather than a primary treatment. Clinical evidence for their effectiveness is limited.

How do I relieve jaw pain from a sinus infection?

Jaw pain during a sinus infection is caused either by referred pain from the maxillary sinuses or by jaw muscle tension from unconscious clenching when unwell. To relieve it: apply a warm compress to the jaw and cheeks for 15 minutes several times a day, take ibuprofen to address both the pain and inflammation, eat only soft foods until the pain subsides, and treat the underlying sinus infection to remove the root cause of the referred pain.

If jaw pain persists after your sinus infection clears, visit your dentist to rule out a TMJ disorder or other jaw condition that may have been aggravated during your illness.

Why is my sinus tooth pain on one side only?

One-sided sinus tooth pain is common and reflects how sinus infections develop. Infections frequently affect one maxillary sinus more than the other — particularly when there is a structural asymmetry such as a deviated septum, or when congestion is more pronounced on one side. Since each maxillary sinus sits above only the upper teeth on the same side of the face, inflammation in the left sinus produces pain in the left upper teeth, and vice versa.

One-sided pain is actually a useful diagnostic clue that sinus — rather than dental — issues are responsible, especially when there is one-sided congestion or facial pressure on the same side.

Can sinus pressure cause unbearable tooth pain?

Yes. While sinus tooth pain is most commonly described as a dull ache or pressure, severe sinus infections can generate enough pressure to cause intense, debilitating pain in the upper teeth. This does not mean the teeth are damaged — it simply reflects the severity of the sinus inflammation.

If over-the-counter medications and home remedies are not providing relief, see a doctor promptly. Bacterial sinusitis typically requires antibiotics to fully resolve, and significant pain that does not respond to home treatment is a sign that a medical evaluation is needed. Also have a dentist rule out a dental abscess, which can produce similarly severe pain and may require urgent treatment.

Can a sinus infection make your teeth hurt even if your teeth are healthy?

Absolutely. This is precisely what happens in sinus-related tooth pain. The teeth are structurally intact and free of decay, infection, or damage. The pain is entirely caused by sinus pressure compressing the nerve fibres near the tooth roots. Dental X-rays will show healthy teeth with no abnormalities.

This is also why it is important not to rush into dental treatment for upper tooth pain that appears during or following a cold or sinus infection. A proper evaluation — including a review of your sinus symptoms — can save you unnecessary procedures and expense.

How long does sinus tooth pain last?

Sinus tooth pain caused by a viral upper respiratory infection (cold or flu) typically resolves within 7–14 days as the infection runs its course. Bacterial sinusitis may last longer — usually 10 days or more without treatment — but generally improves within a few days of starting antibiotics. Chronic sinusitis (inflammation lasting 12 weeks or longer) can cause persistent or recurring tooth pain that requires more comprehensive medical management.

If your tooth pain persists after your nasal and sinus symptoms have cleared, see a dentist to rule out a dental cause.

Summary: What to Remember About Sinus Tooth Pain

Sinus infection tooth pain is a genuinely common experience that causes significant distress — not least because it mimics a dental emergency so convincingly. Understanding the anatomy behind it, knowing how to distinguish it from real dental pain, and having a clear plan for relief can make the experience far less frightening and easier to manage.

• Sinus pressure can absolutely cause tooth pain — specifically in the upper back teeth, via the maxillary sinuses
• The key distinguishing features are multiple affected teeth, worsening with head position, and accompanying sinus symptoms
• Effective at-home relief includes hydration, saline rinse, steam, warm compresses, and ibuprofen
• Odontogenic sinusitis — where a tooth infection causes a sinus problem — is real and should be evaluated if sinus infections are recurrent or one-sided
• Persistent or severe pain, or pain that continues after the sinus infection clears, always warrants professional evaluation

If you are in the North York or Toronto area and are uncertain whether your tooth pain has a sinus or dental origin, the team at Smile By Design can help you get a definitive answer quickly. We offer thorough dental evaluations, digital X-rays, and a caring environment that makes it easy to get the right diagnosis — and the right treatment — the first time.