What is an oral-sinus opening after a tooth extraction?

After an upper back tooth is removed, it can feel unsettling to hear that the site may have opened into your sinus. This is called an oral-sinus opening, or oroantral communication, and some heal on their own while others need a repair.¹ If you suspect one, contact the provider who treated you so they can examine the area and explain what happens next. 

What you will learn in this article: 

• Why removing an upper back tooth can create an opening into the sinus 

• Which changes after an extraction deserve a call to your provider 

• How an examination helps determine whether an opening needs repair 

• Which habits to ask your provider about while the area heals 

Planning an extraction or discussing your treatment options? Schedule an appointment with an Aspen Dental provider. 

Why can an upper tooth extraction create a sinus opening? 

The maxillary sinuses sit above the upper back teeth. Depending on your anatomy, tooth roots may lie very close to the sinus floor. Removing a tooth in this area can leave a connection between the mouth and sinus, which providers may also describe as a sinus perforation.²

This is a recognized risk of upper wisdom tooth removal. Your oral surgeon takes precautions to reduce the risk, but the relationship between the roots and sinus matters.¹ Ask whether your tooth's position calls for any special instructions after the extraction. 

What symptoms should you report after an extraction? 

Tell your treating provider about any change that makes you wonder whether the extraction site and your sinus are connected. An opening can let fluids and bacteria pass between your mouth and sinus.³ 

Sinus pain or drainage after an upper wisdom tooth extraction also warrants a call. Report fever, increasing pain, worsening swelling or pus promptly, since these can be signs of infection.¹ Do not wait for a routine follow-up if these symptoms develop. 

When you call, explain which tooth was removed, when the procedure happened and when you first noticed the change. Avoid repeatedly testing the area to see whether fluid or air still passes through it. 

How does a dentist diagnose an oral-sinus opening? 

Your provider examines the extraction site and asks about your symptoms. Dental X-rays may help show a break in the sinus floor. In some cases, a three-dimensional scan called cone beam computed tomography provides more detail about the opening and surrounding sinus. Imaging supports the examination; a scan alone does not replace a clinical assessment.² 

Bring your discharge instructions and medication list if you are seeing a different provider. Useful questions include: Is there an opening? Does it need closure? When should it be checked again? 

Can an oral-sinus opening heal on its own? 

Some small openings close without surgical repair. Larger openings may need a procedure to seal the connection.² The choice also depends on how long the opening has been present, whether infection is involved and the condition of the tissue available for repair.³

A persistent opening can develop into an oroantral fistula, a passage that has formed a tissue lining. Once that happens, closing on its own is unlikely.³ That is why “it might heal on its own” should mean a provider has assessed it and arranged monitoring, rather than waiting indefinitely at home. 

What does treatment involve? 

Repair may involve stitches or moving nearby soft tissue over the opening to close it. Medication, such as an antibiotic or nasal decongestant, may also be part of the treatment plan.² Your provider should explain what each treatment is intended to do and how to use any prescribed medicine. 

Before leaving, make sure you know whom to contact with concerns and when to return. Ask for written instructions if the plan feels difficult to remember. 

How can you protect the area while it heals? 

If your provider gives you sinus precautions, follow them for the length of time they specify. Smoking and nose-blowing are among the habits that may make it less likely for an opening to close on its own.³ Ask exactly which precautions apply to you, including what to do about sneezing, straws and rinsing. 

General guidance on recovery after an emergency dental procedure may differ from your sinus precautions, so follow your provider’s instructions if they conflict. 

Keep your follow-up appointment even if symptoms improve. Some openings heal on their own, but others need additional treatment, so persistent or returning symptoms deserve another look.¹ 

Have questions about your dental care or extraction planning? Schedule an examination with your local dental provider. If you already have symptoms after an extraction, contact your treating provider promptly. 

What is an oral-sinus opening after a tooth extraction? FAQs 

Is a sinus opening the same as dry socket? 

No. Dry socket happens when the protective blood clot fails to form or is lost, leaving bone exposed. A sinus opening connects the extraction site with the sinus.¹ Pain alone cannot tell you which problem is present. Describe your symptoms to the treating provider rather than trying to identify the cause yourself. 

Can I check for an opening by blowing my nose? 

Do not try to test it this way. Nose-blowing is one of the habits that may make it less likely for an opening to close on its own.³ Call your provider and describe what you have already noticed. They can assess the area without asking you to reproduce the symptom at home. 

Can a sinus opening lead to a sinus infection? 

It can. An opening lets bacteria and fluids pass between the mouth and sinus, which can lead to a sinus infection or slower healing.²^,³ Drainage, sinus pain or fever after an upper tooth extraction deserve a call to your provider.¹ 

Sources 

¹ American Association of Oral and Maxillofacial Surgeons: “Potential Complications of Wisdom Teeth Extractions.” https://myoms.org/what-we-do/wisdom-teeth-management/potential-complications-of-wisdom-teeth-extractions/ 

² Korean Academy of Oral and Maxillofacial Radiology, Imaging Science in Dentistry: “Oroantral communication, its causes, complications, treatments and radiographic features: A pictorial review.” https://doi.org/10.5624/isd.20210035 

³ Springer Nature, Oral and Maxillofacial Surgery: “Management strategies and determinants of clinical decision-making in oroantral communication among dental practitioners.” https://doi.org/10.1007/s10006-026-01508-w