Sinus Pain or Toothache? How to Tell the Difference

Your upper back teeth ache, maybe on both sides, maybe on one. You also have a blocked nose, pressure behind your cheeks, or a cold that will not quite clear. You are left wondering whether to call a dentist or a doctor.

It is a fair question, because the roots of your upper back teeth sit right next to your maxillary sinuses, the air filled spaces inside your cheekbones. When those sinuses are inflamed, the pressure can feel exactly like toothache. And the reverse happens too: an infected upper tooth can sometimes irritate the sinus above it.

The good news is that the two usually leave different clues. This guide explains what to look for, what you can safely try at home, and when it is worth being seen.

First, the Signs That Need Prompt Care

Whatever the cause, some symptoms should not wait. Contact a dentist or doctor today if you have:

Swelling of the face, cheek, gum, or around the eye
A fever along with facial or tooth pain
Severe, throbbing pain that keeps you awake
A pimple-like bump on the gum, pus, or a foul taste
Sinus symptoms lasting more than about ten days, or getting better and then suddenly worse

Go to a hospital emergency department if swelling is spreading toward your eye or into your neck, if your vision changes, or if you have a severe headache, a stiff neck, confusion, or trouble swallowing or breathing. Our guide to tooth abscess warning signs explains the dental side of these warning signs.

Why Sinuses Can Make Your Teeth Hurt

The floor of each maxillary sinus sits just above the roots of the upper molars and premolars. In many people the roots are separated from the sinus only by a thin layer of bone, and sometimes the tips poke up into the sinus floor.

When the sinus lining swells from a cold, allergies, or sinusitis, which means inflammation of the sinuses, the pressure and inflammation press on the nerves around those roots. The brain often cannot tell exactly where the signal is coming from, so it reads as toothache. Doctors call this referred pain, pain felt in one place but caused by a problem somewhere else.

Side by Side: Sinus or Tooth?

No single clue settles it, but the overall pattern usually points one way.

What you notice	Points toward sinus	Points toward a tooth
Which teeth hurt	Several upper back teeth, often both sides	One tooth you can usually point to, upper or lower
Lower teeth involved	Rarely	Possible
Effect of bending forward or jumping	Pain gets worse	Little change
Effect of hot, cold, or sweet	Little change	Sharp or lingering pain
Pain when biting	Mild, spread across several teeth	Sharp on one tooth
Other symptoms	Blocked nose, thick mucus, facial pressure, reduced smell	Gum swelling, bad taste, visible hole or crack
Timing	Started with a cold or allergy flare	Built up separately, or after dental work
Response to decongestant	Often eases	Usually no change

Simple Checks You Can Do at Home

These are not a diagnosis, but they help you describe your pain and decide who to call.

The bend test. Stand, then bend forward so your head is below your waist for a few seconds. Sinus pain tends to throb more, because the pressure in the sinus shifts. Tooth pain usually does not change much.
The step test. Walk down a few stairs firmly, or bounce lightly on your heels. A jolt of pressure across the upper teeth with each step suggests the sinus.
The temperature test. Sip cold water, then warm water. A sharp or lingering pain in one tooth suggests the tooth itself. Sinus pain rarely cares about temperature.
The tap test. Gently tap each upper back tooth with the end of a clean spoon. If many teeth on one side feel equally tender, that leans toward the sinus. If one tooth is clearly sorer, that leans toward the tooth.
Look at the gum. Check for swelling, redness, or a small bump around a single tooth.

If you would like a structured way to work through your symptoms, the free tooth pain checker screens for emergency signs first and then suggests likely causes.

When It Is Actually the Tooth

Several dental problems can mimic or overlap with sinus pain:

A deep cavity or inflamed nerve. Usually one tooth, with pain on hot, cold, or sweet that may linger.
A tooth abscess. An infection at the root tip of an upper tooth can cause pressure in the cheek and, occasionally, spread into the sinus.
A cracked tooth. A sharp pain on biting or releasing, often hard to pin to one tooth.
Grinding and clenching. Can make several teeth ache, especially in the morning, often with jaw tiredness.
Recent dental work. An upper tooth that has just had a filling, crown, or extraction can be tender for a while.

A dentist can tell these apart with an exam, cold and bite tests, and an x-ray. If the tooth looks healthy and the sinus looks to be the source, they will tell you so.

When It Is Probably the Sinus

Sinus related tooth pain usually comes with other signs: a blocked or runny nose, thick discolored mucus, pressure across the cheeks or forehead, a reduced sense of smell, and often a recent cold or an allergy flare. The aching tends to be dull, spread across several upper teeth, and worse when you bend down or lie flat.

Things that may help, if they are safe for you:

Rest, fluids, and warm compresses over the cheeks
Steam inhalation or a warm shower
Saline nasal rinses or sprays
Over the counter pain relief, taken as the packet directs
A decongestant or antihistamine if appropriate for you, checking with a pharmacist if you take other medicines or have high blood pressure

Most viral sinus problems improve within about a week to ten days. See a doctor if they do not, if they keep coming back, or if you have any of the warning signs above. Antibiotics only help bacterial sinusitis, and a doctor can judge whether that is likely.

When the Sinus Problem Comes From the Mouth

Most of the time the sinus causes the tooth pain, but it can work the other way round. Doctors and dentists sometimes call this odontogenic sinusitis, sinus inflammation that starts from a tooth. Common sources include an infected upper molar or premolar, a root canal tooth that has become reinfected, and, less often, complications after an upper tooth is removed or an implant is placed close to the sinus floor.

Clues that point this way include symptoms mostly on one side, a foul smell or taste, discharge that keeps returning despite treatment from your doctor, and a history of dental work on that side. A dental x-ray or a cone beam scan, a 3D x-ray that shows the roots and the sinus floor in detail, can help confirm it. In those cases the sinus usually settles only once the tooth is treated.

What Your Dentist Will Do

If you book a dental visit, the dentist will usually ask about your symptoms and recent colds, look at the gums and teeth, test the upper teeth with cold, tap them gently, and check your bite. An x-ray shows decay, old fillings, and infection at the root tips. If everything dental looks healthy, they will tell you so and suggest seeing your doctor about the sinuses instead. That answer is useful in itself, because it rules the teeth out.

When the Pain Does Not Settle

If the sinus symptoms clear but your tooth still aches, the tooth needs checking. Equally, a sinus infection on one side that keeps coming back, especially with a bad smell or taste, is worth a dental exam, because an infected upper tooth is a known cause of one-sided sinusitis. A dental x-ray or scan can show whether a root is involved.

A dental exam with x-rays commonly costs about $50 to $250 in the US. That is a range rather than a quote, and location and the type of imaging move it.

Frequently Asked Questions

Can a sinus infection make my teeth hurt?

Yes. The upper back teeth sit right below the maxillary sinuses, so inflammation there can feel like toothache, usually across several teeth. The pain often eases once the sinus problem clears.

Can a tooth infection cause a sinus infection?

It can. An infection at the root tip of an upper molar or premolar can spread into the sinus above, often on one side only. That is why one-sided sinus symptoms that keep returning are worth a dental check.

Should I see a dentist or a doctor first?

If one tooth hurts on hot, cold, sweet, or biting, start with a dentist. If several upper teeth ache with a blocked nose and facial pressure, a doctor or pharmacist is a reasonable first stop. If you are not sure, a dentist can rule the teeth in or out with an exam and x-ray.

Why do my teeth hurt more when I lie down?

Lying flat changes the pressure in the sinuses, so sinus related tooth pain often feels worse at night. A tooth with an inflamed nerve can also throb more when you lie down, because of increased blood flow to the head. Our guide on how to stop a toothache tonight has practical steps for getting through the night.

How long does sinus tooth pain last?

It usually lasts as long as the sinus problem does, often about a week to ten days for a cold. If the tooth still hurts after the stuffiness has gone, see a dentist.

What to Do Next

Check the warning signs first. Swelling, fever, severe pain, or changes in your vision need care today.

If none of those apply, try the bend, temperature, and tap checks and note which teeth hurt and what makes it worse. If the pattern points to one tooth, book a dental visit. If it points to your sinuses, treat the congestion and see a doctor if it does not improve within about ten days. And if the sinus clears but the tooth does not, let a dentist take a look.