How do I tell sinusitis from a tooth apart from a regular cold?

5 signs: 1) symptoms on one side only, 2) bad breath and bad taste, 3) chronic 4+ weeks, antibiotics help only temporarily, 4) pain worsens when bending forward, 5) recent dental work (extraction, root canal) on the affected side. With 2+ signs, see a dentist, not just an ENT.

Can sinusitis dentalis exist without tooth pain?

Yes, in 50% of cases the tooth doesn't hurt. This is the trickiest scenario because the patient doesn't connect the symptoms to teeth. A hidden chronic infection (periapical abscess) can run for years without pain but continuously leak bacteria via the root into the sinus. Only X-ray or 3D scan reveals the source.

Why can't the ENT alone cure dental sinusitis?

The ENT treats the sinus (irrigation, antibiotics, FESS) but not the source, the infected tooth. Symptoms fade for 2-4 weeks (antibiotic window), then return. Without dental treatment the sinusitis becomes chronic. So joint evaluation by dentist and ENT is mandatory when sinusitis dentalis is suspected.

What if my upper tooth extraction opened the sinus?

That's called an oroantral communication (Mund-Antrum-Verbindung, MAV). Standard procedure: the dentist immediately closes the opening with a plastic technique (Plastikverschluss). Antibiotic for 5-7 days, decongestant nasal drops, no nose-blowing for 2 weeks. In 90% of cases it heals without complications. If it doesn't, plastic surgery is needed after 4-6 weeks.

How long does it take before chronic sinusitis is recognized as dental?

On average 2-4 years. Patients first see an ENT, then an allergist, get 5-15 antibiotic courses. The dental cause is often found incidentally on a dental X-ray taken for another reason. So with chronic sinusitis lasting over 8 weeks, get a dental exam right away.

Does GKV cover treatment of odontogenic sinusitis?

Partially. Basic tooth treatment (endodontics, extraction, apicoectomy) is GKV-covered with possible co-pay (microscope, laser. private). The ENT part (FESS, sinus CT) is fully covered. Not covered: 3D dental scan (DVT), private endodontic methods. Total co-pay in complex cases: 200-1500 €.

Can an implant cause sinusitis?

Yes, in 2-5% of upper molar implant cases. Causes: implant too long, pushed into the sinus floor; prior sinus infection; sinus lift complications. Symptoms appear 6-24 months after surgery. Treatment: removal of the problem implant, sinus cleaning, re-implantation after 6 months.

Sinusitis dentalis: how a tooth causes chronic sinusitis

Maria saw her ENT for six months with a blocked nose and cheek pressure. Three rounds of antibiotics. each gave two weeks of relief and the symptoms returned. The CT showed a shadow in the right maxillary sinus. Referral: «Please check with a dentist for a possible odontogenic cause.» Her panoramic X-ray revealed an old root canal at tooth 16 with a hidden periapical abscess. After retreatment and sinus irrigation, the pressure was gone for good in six weeks.

Sinusitis dentalis (odontogenic sinusitis) is a sinus infection caused by a tooth. 10-12% of all chronic sinusitis cases (DGZMK 2024). It often goes undiagnosed for years because patients see an ENT specialist who treats the symptoms but not the source.

Why upper teeth connect to the sinus

Anatomy that explains a lot.

🦴 Bone between root tip and sinus: only 1-3 mm in 20% of people. Sometimes the root literally protrudes into the sinus cavity (Schneider membrane lies directly on the root).

🔄 Shared blood supply: veins and arteries of the upper jaw connect directly with sinus vessels. Infection travels in hours.

👃 Proximity to the natural opening (ostium): once infection reaches the sinus, the ostium swells, drainage fails, infection accumulates. vicious circle.

🦷 Upper molars (6, 7, 8): 60% of odontogenic sinusitis cases. Premolars 25%, other teeth 15%.

Symptoms: when to suspect a «dental» sinusitis

Here's how odontogenic sinusitis differs from a regular viral one.

1

One-sided

Symptoms only on one side of the face. Viral sinusitis is usually bilateral. If only the right side is blocked, check teeth 14, 15, 16, 17 (or 24-27 on the left).

2

Bad smell and taste

Foetor ex ore (bad breath) + bad taste when swallowing nasal mucus. Classic sign of bacterial infection with anaerobic flora, typical of odontogenic causes.

3

Chronicity

Symptoms last 4+ weeks, return after each antibiotic course. If a «regular sinusitis» fails to clear after 10-14 days of standard treatment, consider a tooth.

4

Pressure when bending forward

Cheek pain increases when leaning forward (e.g. brushing teeth). The relevant tooth may be percussion-sensitive (responds to light tapping).

5

The tooth doesn't hurt but looks suspicious on X-ray

Classic scenario. asymptomatic tooth with a hidden periapical lesion. Patient says «my teeth don't hurt», but the X-ray shows a dark shadow at the root. Silent infection running for 5-10 years.

How the diagnosis is made

From an unclear chronic sinusitis to a definitive diagnosis.

1

Exam + dental X-ray (OPG)

The dentist takes a panoramic image. It shows: deep caries, failing fillings, periapical lesions, root canal fills, bone level.

2

3D scan (CBCT/DVT)

Cone-beam CT. Shows complete root anatomy, the sinus relationship, exact infection location. Cost 200-400 € private, rarely covered by GKV.

3

Tooth vitality tests

Cold/heat/electric stimulation of the tooth. Missing or altered response means the nerve is dead. or long since dead. Supports the diagnosis.

4

ENT consultation

Once the dentist confirms an odontogenic cause, referral to ENT for endoscopy and CT of the sinuses. Joint evaluation gives the full picture.

4 treatment options

Treatment ranges from simple to complex depending on the stage and cause.

A

Root canal treatment (endodontics)

If the tooth is salvageable. remove the infected nerve, clean canals, fill them. 80% of cases. Cost: 350-800 € private per molar. Duration: 2-3 visits. Success rate: 85% first treatment, 70% retreatment.

B

Extraction + sinus curettage

If the tooth can't be saved (root fracture, large lesion). Extraction with simultaneous sinus cleaning through the alveolus. Cost: 200-500 € (extraction) + 500-1500 € (curettage). Duration: 1-2 hour surgery.

C

Apicoectomy (root tip resection)

If the root canal can't be redone but the tooth must stay. Surgical access through the gum, removal of infected tissue at the root tip. Cost: 350-700 €. Duration: 1 hour. Success rate: 70-80%.

D

FESS (functional endoscopic sinus surgery)

Done by an ENT surgeon, often in a hospital. Endoscopic cleaning of the sinus and drainage restoration via the nose. Performed in complex cases alongside dental treatment. Cost: GKV-covered. Hospital: 1-3 days.

Sinusitis dentalis: when the dentist fixes your nose