Can a Sinus Infection Make Your Teeth Hurt?

Yes, a sinus infection can make your teeth hurt. The roots of your upper back teeth sit just below the maxillary sinuses, so when those sinuses swell with fluid and pressure, the nerves in the teeth can ache even though the teeth themselves are healthy. Sinus toothache is common and usually temporary, but because an infected tooth can feel almost identical, it is worth having a dentist confirm which one you are dealing with if the pain lasts.

The difference matters. Sinus pain fades as the congestion clears, while a tooth with deep decay or a cracked filling will keep getting worse. If the tooth turns out to have an infected nerve, root canal treatment can relieve the pain and save the tooth, and in many cases the procedure feels no different from a routine filling.

Most people with this kind of ache are not in danger, and a few simple checks at home can point you in the right direction. However, facial swelling, fever with one painful tooth, or pain that wakes you at night are signs to contact an emergency dentist rather than waiting for a cold to pass.

Below you will find a clear, step-by-step way to tell the two problems apart, what relief actually works, and what an exam involves at a trusted dental clinic. We also cover a less obvious link: upper wisdom tooth extraction and how dental problems can sometimes cause sinus trouble, not only the other way around.

Why Sinus Problems Affect Your Teeth

The maxillary sinuses are air-filled spaces inside your cheekbones. Their floor sits directly above the roots of the upper molars and premolars, and in many adults the bone separating the two is paper thin. Sometimes the roots even poke slightly into the sinus.

When you have sinusitis, the lining of the sinus becomes inflamed and the space fills with mucus. That pressure presses on the nerve fibres that supply the upper teeth. Your brain cannot easily tell whether the signal is coming from the sinus or the tooth, so it feels like toothache. This is called referred pain.

Key Definition: Sinus Toothache

A sinus toothache is a dull, pressure-type pain in several upper back teeth caused by inflammation of the maxillary sinus rather than by a problem inside the tooth.

Sinus Toothache or Dental Toothache? How to Tell

These features give strong clues. No single sign is definitive, but the pattern usually is.

Feature	Likely Sinus	Likely Dental
Location	Several upper back teeth, often both sides	Usually one specific tooth, upper or lower
Type of pain	Dull, aching pressure	Sharp, throbbing, or lingering
Bending forward	Pain gets worse	Little change
Other symptoms	Congestion, runny nose, facial pressure, reduced smell	Sensitivity to hot, cold, or sweet; pain on biting
Timing	Starts with a cold or allergy flare	Can start any time, often gradually
Response to decongestants	Improves	No real change

A Simple Self-Check

Stand up, then bend down as if touching your toes for a few seconds. A pressure surge in the upper teeth points toward the sinus.
Gently tap the biting surface of each upper back tooth with a clean fingertip. One tooth that is much more tender than the others points toward a dental cause.
Sip cold water. A sharp, lingering zing in one tooth suggests a dental problem.
Check whether lower teeth hurt too. Lower teeth are not near the sinus, so pain there is almost always dental.

This check is only a guide. It does not replace an examination, particularly if symptoms last longer than a week or two.

Common Causes of Tooth Pain That Mimics Sinus Pain

A dentist in Richmond Hill will rule out these dental problems before blaming the sinus:

Deep decay that has reached close to the pulp
A cracked tooth, which often hurts on release after biting
A dental abscess, an infection at the root tip
Clenching or grinding, which makes several teeth ache in the morning
Gum infection around a partially erupted wisdom tooth
A failing old filling or crown that is leaking bacteria

Can a Tooth Infection Cause a Sinus Infection?

Yes, and this is often overlooked. When an upper molar has an infected nerve, bacteria can spread from the root tip into the sinus floor. This is called odontogenic sinusitis. It is usually one-sided, may have a bad smell or taste, and often does not clear with standard sinus treatment.

Research suggests that a meaningful share of one-sided chronic maxillary sinusitis cases have a dental source. Treating the tooth, with root canal therapy or extraction, is often the step that finally resolves the sinus problem.

Extraction of upper molars or wisdom teeth can occasionally create a small opening between the mouth and sinus. Experienced clinicians plan for this, check for it at the time, and close it when needed. It is one reason upper extractions should be done by a licensed professional with proper imaging.

How to Relieve Sinus Toothache at Home

If your pain fits the sinus pattern, these steps are safe for most adults:

Stay hydrated. Fluids thin mucus so it drains more easily.
Use steam. A warm shower or a bowl of hot water with a towel over your head can ease pressure.
Try saline rinses. A saline spray or sinus rinse bottle flushes out mucus. Use distilled or boiled and cooled water.
Apply a warm compress to your cheeks for ten minutes at a time.
Sleep with your head raised on an extra pillow.
Consider over-the-counter medication such as pain relievers or a short course of decongestant, following the package directions and your pharmacist’s advice.

Safety Note on Medication

Decongestants are not suitable for everyone, including some people with high blood pressure, heart conditions, or who are pregnant. Speak with a pharmacist or physician first. Never place aspirin directly on the gums, as it can burn the tissue.

When to See a Dentist Instead of Waiting It Out

Contact a dental office promptly if any of these apply:

Pain is in one tooth and is getting sharper
Pain lasts more than one to two weeks after cold symptoms improve
Your face, gum, or jaw is swollen
You have a fever alongside tooth pain
There is a bad taste or pus near a tooth
Lower teeth hurt as well
Sinus infections keep coming back on the same side

Swelling that spreads toward the eye or neck, or difficulty swallowing or breathing, needs emergency medical care immediately.

What Happens at the Dental Visit

Conversation. You describe when the pain started, what triggers it, and any recent colds or allergies.
Clinical tests. Gentle tapping, cold testing, and bite testing identify which tooth, if any, is responding abnormally.
Imaging. A periapical or panoramic X-ray shows root tips, decay, and sometimes a thickened sinus lining. In complex cases, 3D imaging gives a clearer view.
Diagnosis and options. If the teeth are healthy, you will be reassured and may be referred to your physician for the sinus. If a tooth is involved, treatment options are explained clearly before anything is done.
Follow-up. A review appointment confirms that the pain has resolved and nothing was missed.

How to Lower the Chance of Sinus Toothache Returning

If you get sinus-related tooth pain every cold or allergy season, a few habits can make flare-ups less frequent and less intense:

Manage seasonal allergies early with guidance from your physician or pharmacist.
Use a humidifier in dry winter months to keep nasal passages moist.
Rinse with saline at the first sign of congestion rather than waiting for pressure to build.
Stay on top of dental checkups so that a hidden tooth problem is never mistaken for “just my sinuses.”
Treat any grinding habit, since clenched jaw muscles can add to facial pressure.

Keeping a short note of when pain starts, which teeth feel it, and whether you had a cold at the time is also useful. It gives your dentist and physician a clear pattern to work from.

Myths About Tooth Pain and Dental Visits

Myth: “If it is just my sinus, a dentist cannot help.” Fact: A dental exam is the fastest way to rule out a tooth problem, which saves you weeks of uncertainty.
Myth: “Antibiotics will fix any tooth pain.” Fact: Antibiotics do not cure an infected nerve. They may be used for spreading infection, but the source still needs treatment.
Myth: “Root canals are the most painful dental treatment.” Fact: Modern anaesthetic makes most root canals comfortable. The procedure removes the pain, it does not cause it.
Myth: “Dental anxiety means I have to put up with pain.” Fact: Nervous patients can ask for extra time, breaks, and a full explanation at each step.

Real Patient Scenarios

Allergy season ache. A patient had pressure in all her upper right molars every spring. Testing showed healthy teeth and a thickened sinus lining on the X-ray. Saline rinses and an allergy plan from her physician solved it.

The “sinus” that was a tooth. Another patient had been treated twice for right-sided sinusitis. An X-ray revealed an abscess on an old filled molar. After root canal therapy, both the toothache and the sinus symptoms cleared.

Wisdom tooth link. A young adult with a partially erupted upper wisdom tooth had recurring gum infections and pressure. Removing the tooth ended the cycle.

Local Care You Can Trust

When you are unsure whether pain is coming from your sinus or a tooth, it helps to see a top dentist in Richmond Hill who takes time to test properly rather than guess. Hummingbird Dental is one of the best and most trusted dental clinics in the area and has earned the Top Choice Award for Richmond Hill Dentist in 2022, 2023, 2024, and 2025.

The office at 10376 Yonge St #202, Richmond Hill, ON L4C 3B8 is open six days a week, including Saturdays, with extended weekday evening hours. New patients and CDCP patients are welcome, and care is available in English, Persian, Russian, Portuguese, Hindi, and Urdu. For urgent pain, the team offers same-day emergency appointments whenever possible, making it a dependable emergency dental clinic in Richmond Hill.

You can reach the clinic by phone at +1 647-370-2024 or by email at info@hummingbirddental.ca. All treatment is provided by licensed dental professionals registered with the Royal College of Dental Surgeons of Ontario (RCDSO), so you can feel confident about safety standards and follow-up care.

Medical Disclaimer

This information is educational and does not replace a professional diagnosis. Tooth pain and sinus pain can overlap, and only a clinical exam and imaging can confirm the cause.

Frequently Asked Questions

How long does sinus tooth pain last?

It usually eases as the sinus infection or congestion clears, often within one to two weeks. Pain that continues after other sinus symptoms are gone should be checked by a dentist.

Can a sinus infection make lower teeth hurt?

Rarely. The maxillary sinuses sit above the upper teeth only, so pain in lower teeth almost always has a dental cause.

Should I see a doctor or a dentist first?

If the pain is in one tooth or you have tooth sensitivity, start with a dentist. If you have classic congestion, facial pressure, and several aching upper teeth, a physician can assess the sinus, and a dentist can confirm the teeth are healthy.

Can an upper tooth extraction affect my sinus?

Occasionally an extraction creates a small opening into the sinus. Your dentist checks for this and manages it, and most small openings heal well with simple precautions like avoiding nose blowing for a short time.

Why does my tooth hurt more when I lie down?

Lying flat increases blood flow and pressure in the head. This can intensify both sinus pressure and inflamed tooth nerves, which is why nighttime toothache should never be ignored for long.