Have you ever had a toothache that seemed to spread to your head, making your face ache and your nose feel blocked? It’s a confusing feeling, and it can be hard to figure out what’s going on. Could it be just a bad tooth or something more? This is where dental sinus infections come in. They’re a hidden problem, but understanding them can help you feel better much faster.
In this guide, we’re going to talk about dental sinus infection symptoms in a very simple way. We’ll explore what they are, what causes them, and, most importantly, how you can tell if your toothache is messing with your sinuses. We’ll also cover when you should see a dentist or doctor, what treatments are available, and how you can try to stop them from happening in the first place.
What Is a Dental Sinus Infection?
Let’s start with the basics. You have spaces in your head called sinuses. Think of them like hollow pockets in your bones, around your nose and eyes. They’re lined with soft, moist tissue and make mucus, which helps keep your nose clean and moist.
A “dental sinus infection” is when an infection from one of your upper teeth spreads into these sinus spaces. The medical term for this is “odontogenic sinusitis.” “Odontogenic” means “coming from a tooth,” and “sinusitis” means “inflammation of the sinuses.” So, it’s a sinus infection that started because of a problem with a tooth.
It’s different from a regular sinus infection, which usually starts because of a cold, allergies, or a virus. The main culprit of a dental sinus infection is a problem in your mouth, usually an infected tooth.
Causes of a Dental Sinus Infection
So, how does a tooth infection end up in your sinuses? It all comes down to how close your teeth are to your sinuses. The roots of your upper back teeth (your molars and premolars) are very close to the floor of your maxillary sinuses. These are the largest sinuses located behind your cheekbones.
Here are the main ways a dental sinus infection can happen:
- Untreated Tooth Decay: If you have a cavity that’s not fixed, the decay can go deeper and deeper into the tooth. It can get infected if it reaches the pulp (the soft, inner part of the tooth with nerves and blood vessels). This infection can then spread from the tip of the tooth root.
- Dental Abscess: When a tooth infection gets bad, it can form a “dental abscess.” This pocket of pus forms at the tip of the tooth root. If this abscess gets big enough, it can break through the bone and push into the sinus cavity.
- Root Canal Problems: Sometimes, an infection can come back or not fully clear up even after a root canal. If this happens, the infection can still spread to the sinus.
- Tooth Extraction Complications: In rare cases, if an upper tooth is pulled, a small opening can be left between the mouth and the sinus. If this opening doesn’t heal properly, bacteria can get into the sinus and cause an infection.
- Gum Disease (Periodontal Disease): While less common, severe gum disease can sometimes lead to bone loss around the teeth. If the infection from the gums is deep enough, it could affect the sinus, though this is not as direct a link as a tooth abscess.
Any dental problem that creates a pool of bacteria or pus near the roots of your upper back teeth has the potential to spread and cause a dental sinus infection.
Dental Sinus Infection Symptoms to Watch For
This is the tricky part because many of the symptoms of a dental sinus infection are similar to a regular sinus infection or even just a bad toothache. However, there are some key signs that point to your tooth being the source of the problem.
Here are the dental sinus infection symptoms you should be aware of:
- Tooth Pain and Sinus Pressure (The Main Clue): This is often the biggest giveaway. You’ll likely have a noticeable toothache, usually in one of your upper back teeth. At the same time, you’ll feel pressure or pain in your face, especially around your cheeks, eyes, and forehead. This pressure might get worse when you bend over or lie down.
- Pain in Multiple Upper Teeth: Instead of just one tooth hurting, you might feel pain in several upper teeth on one side of your face. This is because the inflammation in the sinus can make all the teeth in that area feel sensitive.
- Worsening Pain When Chewing: Your teeth might hurt more when you bite down or chew, a classic sign of a tooth infection.
- Bad Breath or Bad Taste in Your Mouth: If there’s an infection, especially an abscess, it can sometimes drain into your mouth, causing a foul taste or bad breath.
- Nasal Congestion or Blockage (Usually One-Sided): You’ll likely feel blocked on one side of your nose, like the infected tooth. This is different from a cold, where both nostrils might be blocked.
- Discharge from Your Nose: You might have thick, yellow or green mucus draining from one nostril.
- Headache: A dull, throbbing headache, often felt in the forehead or around the eyes, is common.
- Fever: While not always present, a fever can signify that your body is fighting a significant infection.
- Fatigue: Feeling tired and generally unwell is also a common symptom of infection.
- Pain When Tapping on Your Teeth: A dentist, like dentist Ballarat, might gently tap your upper teeth. If one tooth is much more sensitive than the others, especially if it’s dead or infected, it points to a dental problem.
- Swelling in the Face: In some cases, you might notice slight swelling around your cheek or under your eye on the affected side.
It’s important to remember that if your sinus problems clear up with antibiotics but your toothache doesn’t, or if the sinus issues keep coming back, a dental cause is highly likely.
How to Tell If It’s a Dental or Sinus Issue
This is often the hardest part for people. Here are some questions to ask yourself to help figure it out:
- Where did the pain start? Did you first have a toothache, and then sinus symptoms appeared? Or did you have cold symptoms, and then tooth pain followed? If the tooth pain came first, it’s more likely dental.
- Is the pain on one side or both? Dental sinus infections usually affect only one side of your face and head, the side with the infected tooth. Regular sinus infections from a cold or allergies often affect both sides.
- Do you have other cold or flu symptoms? If you have a runny nose, sneezing, sore throat, body aches, and sinus pressure, it’s more likely a common cold or flu rather than a regular sinus infection. If it’s just the sinus and tooth symptoms, a dental cause is more probable.
- Is a specific tooth hurting? Can you pinpoint one or two upper back teeth more sensitive to hot, cold, or pressure? If so, that’s a strong indicator.
- Have you had recent dental work or ignored a cavity? If you know you have an untreated cavity or recently had dental work on an upper tooth, this increases the suspicion of a dental cause.
- Does bending over make your toothache worse? If bending over significantly increases the pain in your upper teeth, it suggests pressure in the sinus, which could be from a dental infection.
Ultimately, the best way to tell is to see a professional.
When to See a Dentist or GP in Ballarat
If you’re experiencing any of the dental sinus infection symptoms we’ve discussed, especially if you have a persistent toothache along with sinus problems, it’s crucial to see a dentist first.
Why a dentist? Because they can examine your teeth, take X-rays, and determine if the root of the problem is dental. If they find an infected tooth or abscess, they are the right person to treat it.
You might also see a GP (General Practitioner or family doctor) if your sinus symptoms are very severe or if you’re unsure if it’s dental. However, if a tooth is involved, the GP will likely send you to a dentist anyway.
Seek immediate medical attention if you have:
- Severe facial swelling that is spreading quickly.
- Changes in your vision or double vision.
- Difficulty breathing or swallowing.
- A very high fever or chills.
- Severe headache that doesn’t go away.
These could be signs of a more serious infection that needs urgent care.
Treatment Options
The treatment for a dental sinus infection focuses on two main things: dealing with the tooth problem and clearing up the sinus infection.
- Treating the Dental Problem
- Root Canal Therapy: If the tooth is savable, a root canal is often the treatment of choice. This involves cleaning out the infected pulp from inside the tooth, filling it, and crowning it to protect it.
- Tooth Extraction: If the tooth is too damaged to be saved or if a root canal isn’t possible, the tooth may need to be pulled out. This removes the source of the infection.
- Draining an Abscess: Sometimes, a dentist might need to drain a dental abscess to release the pus and pressure.
- Antibiotics: Your dentist almost always prescribes antibiotics to fight bacterial infections in the tooth and sinus. It’s very important to take all antibiotics as prescribed, even if you start feeling better.
- Managing Sinus Symptoms
- Decongestants: Over-the-counter decongestants (like pseudoephedrine or phenylephrine) can help reduce swelling in your nasal passages and make breathing easier. Use these cautiously and follow directions, as prolonged use can sometimes worsen things.
- Nasal Saline Rinses: Rinsing your nasal passages with a saline solution (salt water) can help clear mucus and reduce inflammation.
- Pain Relievers: Over-the-counter pain relievers like ibuprofen or acetaminophen can help manage pain and reduce fever.
- Warm Compresses: Applying a warm, moist cloth to your face can help relieve sinus pressure.
- Steam Inhalation: Breathing in steam from a bowl of hot water (carefully to avoid burns) can help loosen mucus.
It’s important to understand that simply treating the sinus symptoms without addressing the underlying dental infection will likely lead to a recurrence of the dental sinus infection. The source of the problem needs to be fixed.
Preventing Dental Sinus Infections
The good news is that most dental sinus infections are preventable! It all comes down to good oral hygiene and regular dental care.
Here’s how you can reduce your risk:
- Practice Excellent Oral Hygiene: Brush your teeth twice a day for two minutes with fluoride toothpaste.
- Floss daily to remove food particles and plaque between your teeth and the gumline.
- Use an antiseptic mouthwash if recommended by your dentist.
- Regular Dental Check-ups and Cleanings (dentist Ballarat, Ballarat dental clinic Sebastopol): This is perhaps the most important step. Visiting your dentist at least once a year, or more often if they recommend it, allows them to:
- Catch cavities early: Small cavities are much easier to treat before they become deep and infected.
- Identify gum disease: Early treatment of gum disease can prevent it from worsening.
- Spot other potential problems: Your dentist can often see signs of issues before they cause significant pain. If you’re looking for a trusted dentist in Ballarat, specifically a Ballarat dental clinic in Sebastopol, consistent check-ups are your best defence.
- Address Dental Problems Promptly: If you have a toothache, sensitivity, or any other dental concern, don’t put off seeing the dentist. The sooner you treat a problem, the less likely it is to escalate into a severe infection.
- Maintain a Healthy Diet: Limit sugary foods and drinks, which contribute to tooth decay.
- Stay Hydrated: Drinking plenty of water helps keep your mouth moist and can aid in mucus flow in your sinuses.
Being proactive with your dental health can significantly reduce your chances of developing a dental sinus infection.
Conclusion
Dental sinus infections can be tricky because their symptoms overlap with other common conditions. However, by understanding the connection between your upper teeth and sinuses and knowing the key dental sinus infection symptoms, you can better identify if your toothache affects your sinuses.
Remember, a persistent toothache combined with facial pressure, nasal congestion on one side, or a bad taste in your mouth are all strong signals that a dental sinus infection might be brewing. Don’t ignore these signs! The quicker you get a diagnosis and treatment, the faster you’ll feel better and prevent more serious complications.
If you suspect you have a dental sinus infection or are experiencing a persistent toothache and sinus pressure, don’t wait. Contact your dentist today for a thorough examination. Early diagnosis and treatment are key to a quick recovery and preventing future problems. Your oral health is deeply connected to your overall well-being!

Dr. Ayesha Aijaz is a highly esteemed dentist in Ballarat and Doreen, Victoria, with over two decades of experience in the field. She holds a Bachelor of Dental Science from the University of Melbourne and specializes in cosmetic dentistry, early intervention for children, and comprehensive parental education on dental health. Dr. Ayesha Aijaz is a member of the International Association of Orthodontics. Her practice, SmileWorks Dental Ballarat, is known for providing top-notch dental care with a focus on patient trust and well-being.