Paradox of wisdom teeth is that they become a problem precisely because of their delayed eruption. By the age of 17–25, the dental arch is fully formed, and there is physically no space left for the third molars — dentists call this a «space deficiency». According to the Spanish Colegio de Dentistas, about 1.2 million wisdom tooth removal operations are performed annually in Spain, a significant portion of which are elective procedures in private clinics, since the public Seguridad Social does not cover this intervention for adult patients without acute medical indications. Removing a wisdom tooth «just in case» is not recommended today: modern surgical dentistry prefers a balanced approach — surgery only when there is a clear justification.
1. How the third molar differs from other teeth
Lower and upper wisdom teeth have the most unpredictable anatomy of all human teeth: the number of roots varies from one to five, their shape ranges from straight to S-shaped, and the direction of eruption can be at an angle from 0 to 90 degrees relative to the adjacent molar. This is why two patients with similar complaints may receive completely different recommendations: in one, the wisdom tooth will erupt on its own and settle into the correct position; in another, a complex operation with an incision, sectioning of the tooth into fragments, and suturing will be required. Without an X-ray or CT scan, it is impossible to predict the outcome.
The lower wisdom teeth are located in close proximity to the inferior alveolar nerve (n. alveolaris inferior) — the structure responsible for the sensitivity of the lower lip, chin, and part of the tongue. According to the Department of Oral Surgery at the University of Barcelona (UB), in 32–38 % of patients, the roots of the lower wisdom teeth project over the mandibular canal on a panoramic X-ray — and only a CT scan can accurately determine whether they wrap around the nerve or merely overlap visually. This is fundamentally important: the choice of strategy depends on it — standard extraction or coronectomy (intentional preservation of the roots).
Upper wisdom teeth create a different risk — their proximity to the maxillary sinus. According to Hospital Clínic Barcelona, residents of the Mediterranean region have on average larger sinuses than northerners, which statistically increases the likelihood of perforating the sinus floor during upper wisdom tooth removal. The surgeon must know this before the operation.
2. Five situations where removal is mandatory
Accumulated clinical practice has clearly defined cases in which «let’s wait» is not a strategy, but a source of future complications.
- Recurrent pericoronitis. Inflammation of the mucous operculum over a partially erupted wisdom tooth is a predictably recurring issue. The first episode is managed with rinses and antibiotics (Augmentine — amoxicillin with clavulanic acid, the Spanish standard), but the second occurs within 2–6 months and is more severe. As long as the tooth crown is partially covered by the gum, the pocket between the tooth and the mucosa remains a breeding ground for anaerobic bacteria.
- Pressure on the second molar. A horizontally positioned wisdom tooth mechanically presses against the distal root of the second molar. On an X-ray, this appears as a triangular radiolucency near the root — proximal caries or the beginning of resorption. Both processes are irreversible and over time jeopardize not the wisdom tooth, but the healthy second molar.
- Follicular cyst. A cystic cavity often forms around the crown of an impacted tooth. In its early stage, it is asymptomatic. When cysts exceed 10 mm in size, they destroy bone tissue and require not only tooth extraction but also cystectomy.
- Caries of the wisdom tooth or the second molar due to crowding. Filling under conditions of limited access is extremely unreliable: even with a microscope, adhesion on the distal surface of the second molar is unstable, and caries recurs. Removing the wisdom tooth is more productive than repeated re-filling.
- Orthodontic preparation. In cases of severe space deficiency, the orthodontist may include the removal of wisdom teeth in the treatment plan before placing braces or aligners. The decision is made individually based on cephalometric analysis. Automatically removing wisdom teeth «for braces» is not necessary — this approach is outdated.
3. When a wisdom tooth can and should be left
Three conditions, when all are met, make removal inadvisable: the tooth has erupted fully or at least sufficiently to be cleaned properly with a toothbrush; OPG or CT shows no pressure on the root of the second molar and no signs of a cyst; the patient has not experienced a single episode of pericoronitis in the last two years.
An asymptomatic impacted wisdom tooth in patients over 26 years of age is often left under observation: the risk of surgical intervention in the absence of symptoms may be higher than the risk posed by the tooth itself. The position of the Spanish Ministerio de Sanidad: prophylactic removal of asymptomatic wisdom teeth in adults over 25 lacks sufficient evidence. A control OPG every 2–3 years is a reasonable alternative to immediate surgery.
| Important «Let’s wait a year» is a decision, not a postponement. It requires a specific date for the next X-ray and a clear list of symptoms that, if they appear, warrant an earlier appointment. Observation without a plan is just procrastination. |
4. Diagnostics: what you need to know before surgery
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Periapical X-ray
Number of roots, curvature, periodontal condition, eruption stage.
✓ Basic minimum
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OPG (panoramic X-ray)
Position of all wisdom teeth, follicular cysts, relationship to the mandibular canal and maxillary sinuses.
→ For planned extraction
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CT (cone beam)
3D relationship of roots and nerve with 0.1 mm accuracy; maxillary sinus volume.
⚠ When close to the nerve
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In Barcelona clinics, a CT scan is typically performed on the same day — the images are sent to the surgeon in DICOM format. If you have already had a wisdom tooth CT scan elsewhere, bring a digital copy: repeat exposure without necessity is inadvisable.
5. How the operation proceeds: three scenarios
Scenario 1 Erupted tooth with straight roots
The surgeon administers an anesthetic: on the upper jaw — infiltration, on the lower jaw — mandibular block with 4 % articaine and epinephrine 1:100,000. After anesthesia takes effect (3–5 minutes), an elevator or luxator is used to separate the circular ligament of the tooth, loosen it with rotational movements, and extract it with forceps. The socket is irrigated with chlorhexidine, and 1–2 sutures are placed if necessary. Total time with anesthesia — 25–40 minutes.
Scenario 2 Partially impacted or dystopic tooth
After anesthesia, the surgeon makes a gingival incision to create a trapezoidal flap, exposing the crown. If the tooth is pressing against the second molar — it is divided into 2–3 fragments using a bur or piezotome and removed piecemeal without applying lever pressure on the adjacent tooth. After socket debridement, sutures are placed (resorbable Vicryl or nylon 3-0, removal after 7–10 days). Operation time — 35–70 minutes.
Scenario 3 Coronectomy — for high risk to the nerve
If CT shows that the roots of the lower wisdom tooth tightly encircle the inferior alveolar nerve, Spanish surgeons resort to coronectomy — intentional removal of only the crown, leaving the roots in situ. The frequency of paresthesia with this method drops from 4–8 % to 0.5–1 %. The roots migrate apically over time — in 80 % of patients, after 3–5 years they have descended enough to allow safe completion of the extraction if necessary.
6. Healing dynamics: normal vs. warning signs
The most common reason for anxious calls to the clinic is not knowing the normal picture. The blocks below will help you assess the situation on your own.
Days 1–2Beginning of healing
✓ Normal
Aching pain relieved by ibuprofen. Cheek swelling. Limited mouth opening (trismus). Saliva slightly blood-tinged.
⚠ Warning sign
Bleeding does not stop for more than 90 minutes. Acute, increasing pain from the first hours, not relieved by painkillers.
Days 3–4Peak of swelling
✓ Normal
Swelling peaks, then subsides. Pain decreases. Mild bruising on the cheek or neck — normal with deep extraction.
⚠ Warning sign
Pain worsens. A foul odor emanates from the socket, which looks empty and gray — dry socket (alveolitis). Temperature above 38 °C (100.4 °F).
Days 5–7Suture removal
✓ Normal
Suture removal (nylon). Mouth opening improves. Pain is minimal. The gum begins to cover the socket.
⚠ Warning sign
Numbness of the lower lip or chin persists for more than 72 hours — nerve paresthesia, requires surgeon consultation.
Weeks 2–4Recovery
✓ Normal
Socket covered by mucosa. Chewing restored. Slight sensitivity when pressing with the tongue — normal.
⚠ Warning sign
Fistula on the gum with discharge. Persistent swelling — possible suppuration.
Months 1–3Bone regeneration
✓ Normal
Bone regeneration is ongoing. Full restoration of alveolar volume — after 3–6 months. No discomfort.
⚠ Warning sign
Pain upon pressure in the area of the former socket — rule out osteomyelitis.
7. Dry socket (Alveolitis): the most common complication
Doctors in Barcelona clinics encounter dry socket in approximately 8–12 % of lower wisdom tooth extractions — this is higher than the average for other teeth (2–5 %) because wisdom teeth are removed in a hard-to-reach area with poorer blood supply. The essence of the problem: the blood clot that fills the socket in the first hours is either mechanically washed out (rinsing, straw, smoking) or bacterially lysed. As a result, the exposed bone wall irritates the nerve endings, and pain sharply increases on days 2–4 instead of subsiding.
Treatment is only by a doctor: the socket is irrigated with warm saline or chlorhexidine, then an iodoform strip or bioactive collagen dressing (Alvogyl — the standard in Spanish clinics) is placed. The dressing is changed after 2–3 days. Self-treatment with honey, baking soda, or clove oil does not achieve drainage and irritates the mucosa. Systemic antibiotics for dry socket are prescribed only if there are signs of infection — dry socket itself is not an infectious complication.
8. List of prohibitions: the first 72 hours
Strictly prohibited after wisdom tooth extraction
| ✗Rinse mouth vigorously — washes out the clot and provokes dry socket |
| ✗Smoke — nicotine increases the risk of dry socket 3.5 times (J Oral Maxillofac Surg, 2020) |
| ✗Drink through a straw — negative pressure dislodges the clot |
| ✗Apply heat to the face (sauna, hot compress) — provokes swelling and bleeding |
| ✗Consume alcohol in the first 48 hours — incompatible with metronidazole |
| ✗Touch the socket with tongue, toothpick, or cotton swab |
| ✗Take aspirin as a painkiller — thins the blood |
| ✓Allowed: gently rinse with chlorhexidine after 24 hours, soft food at room temperature, cold compress externally |
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9. Wisdom tooth pain: what to do before seeing a doctor
Acute pain during wisdom tooth eruption or pericoronitis is inflammatory pain, so the best choice for pain relief are medications with an anti-inflammatory component. Ibuprofen 400 mg — first line for adults without gastrointestinal contraindications. Dosing interval — no more than once every 6 hours, maximum daily dose — 1200 mg. If the effect is insufficient, add paracetamol 500 mg in between — this combination works additively. In Spanish pharmacies, Neobrufen (ibuprofen) and Paracetamol Kern Pharma are available without a prescription; nimesulide (Nimesuil) requires a prescription.
Locally: rinsing with 0.12 % chlorhexidine (Perio-Aid or Oraldine Perio — the standard choice of Catalan dentists) reduces the bacterial load under the operculum. For significant cheek swelling — a cold compress externally (15 minutes per hour) for the first 12 hours. All these measures are temporary: they relieve the acute episode but do not eliminate the cause.
| Emergency care in Barcelona for acute tooth pain
• Weekdays: most private clinics take urgencia (walk-ins) — call ahead
• Weekends and holidays: guardia dental — Barcelona on-call dental service
• List of on-call clinics: coedib or the Col·legi de Dentistes de Catalunya app
• Emergency number (112) — only for neck swelling, difficulty breathing, or temperature above 39 °C (102.2 °F)
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10. After healing: is an implant needed in place of the wisdom tooth
The site of an extracted wisdom tooth generally does not require replacement. Wisdom teeth are not part of the normal occlusal scheme: their antagonists in most cases will also have been removed or were originally absent. However, if a patient lacks a second molar and the wisdom tooth was the only functioning tooth in that quadrant — after its extraction, implantation or a removable prosthesis is advisable.
If a patient plans implantation in the area of the second molar, the surgeon may perform the extraction and simultaneously carry out socket augmentation — filling with a bone substitute (Bio-Oss, MinerOss) with a membrane. This preserves the bone ridge volume for implant placement after 3–4 months and avoids a separate bone grafting procedure.
| Key takeaways from the article
• A wisdom tooth should be removed for pericoronitis, pressure on the second molar, cysts, inaccessible caries. It should not be removed — if the tooth has assumed a correct position and can be cleaned properly.
• CT before lower wisdom tooth extraction when close to the nerve is not a whim, but a safety standard.
• Three main prohibitions after surgery: do not smoke, do not rinse vigorously, do not apply heat — these are 90 % of dry socket prevention.
• Pain increasing on days 3–4 + foul odor from the socket = dry socket. Requires a medicated dressing from a doctor, not home remedies.
• In Barcelona for acute pain — urgencia dental the same day, on weekends — guardia dental (coedib.com).
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Sources
- Ghaeminia H. et al. Position of impacted third molars in relation to the mandibular canal. J Oral Maxillofac Surg, 2014.
- Cervera-Espert J. et al. Coronectomy of the mandibular third molar: a meta-analysis. Med Oral Patol Oral Cir Bucal, 2016.
- Bouloux GF et al. Complications of third molar surgery. Oral Maxillofac Surg Clin North Am, 2007.
- COEM. Posición sobre exodoncia profiláctica de terceros molares. Madrid, 2019.
- Clinical guidelines «Difficult eruption of wisdom tooth». StAR, 2021.
- Adeyemo WL. Do pathologies associated with impacted lower third molars justify prophylactic removal? Oral Surg Oral Med, 2006.
The article is for informational purposes and does not replace an in-person consultation with an oral surgeon.
Reviewed by:
Peralonso Celis Morata, Oral Surgeon at Clínica Corona, Barcelona · 13.06.2026
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