The paradox of wisdom teeth is that they become a problem precisely because of their late emergence. By ages 17–25, the dentition is fully formed, and there is physically no space left for the third molars — dentists call this "space deficiency." According to data from the Spanish Colegio de Dentistas, about 1.2 million wisdom tooth extraction 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. However, extracting the wisdom tooth "just in case" is also 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 ranges from one to five, their shape from straight to S-shaped, and the eruption direction can be at an angle from 0 to 90 degrees relative to the adjacent molar. This is why two patients with similar complaints can receive completely different recommendations: in one, the wisdom tooth will erupt on its own and settle into the correct position; in the other, a complex operation with an incision, sectioning of the tooth into fragments, and suturing will be required. Without an X-ray or CT scan, predicting the outcome is impossible.
Lower wisdom teeth are located in close proximity to the inferior alveolar nerve (n. alveolaris inferior) — a 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 CT can accurately determine whether they wrap around the nerve or merely overlap visually. This is crucial: the choice of tactic depends on it — standard extraction or coronectomy (intentional preservation of the roots).
Upper wisdom teeth create a different anatomical risk — proximity to the maxillary sinus. In inhabitants of the Mediterranean region, the sinuses are on average more voluminous than in inhabitants of Northern Europe: this was shown by a comparative study from the Department of Otorhinolaryngology at Hospital Clínic Barcelona. The consequence is that when removing upper wisdom teeth, the probability of perforation of the maxillary sinus floor is statistically higher in Catalan patients. The surgeon must know this in advance and, if necessary, arrange a consultation with an ENT surgeon.
2. Five situations where extraction is mandatory
Accumulated clinical practice has clearly defined cases where "let's wait" is not a strategy, but a source of future complications.
Inflammation of the mucous operculum over a partially erupted wisdom tooth is a predictably recurrent story: the first episode is resolved with rinses and antibiotics, but the second typically occurs within 2–6 months and is more severe. Antibiotics (amoxicillin with clavulanic acid — Augmentine in Spanish pharmacies — or metronidazole in case of allergy) resolve the acute process but do not eliminate the cause: as long as the tooth crown is partially covered by the gum, the pocket between the tooth and mucosa remains a breeding ground for anaerobic bacteria.
A horizontally positioned or forward-tilted wisdom tooth mechanically pushes against the distal root of the second molar. In early stages, this appears on an X-ray as a triangular darkening near the root — proximal caries or the beginning of root resorption. Both processes are irreversible and over time threaten not the wisdom tooth, but the completely healthy second molar.
A cystic cavity often forms around the crown of an impacted tooth — a follicular cyst. In its early stage, it is asymptomatic and only detected on X-ray. When larger than 10 mm, cysts begin to destroy bone tissue and require not only tooth extraction but also surgical treatment of the cavity — cystectomy.
Filling under conditions of limited access is one of the most technically complex cases in therapeutic dentistry. Even with the use of a contra-angle handpiece and a microscope, achieving reliable adhesion of the filling on the distal surface of the second molar is extremely difficult, which is why caries there recurs. Eliminating the cause — removing the wisdom tooth — is in this case more productive than repeated refilling.
When there is a pronounced lack of space in the dental arch, the orthodontist may include the extraction of wisdom teeth in the treatment plan before placing braces or aligners. This is not always done: the issue is decided individually based on cephalometric analysis and a lateral cephalogram. Automatically removing wisdom teeth "for braces" is not necessary — that approach is outdated.
3. When the wisdom tooth can and should be left
Three conditions, when met simultaneously, make extraction inadvisable: the tooth has fully erupted or at least sufficiently enough that it can be properly cleaned with a short-head brush; the panoramic X-ray or CT shows no pressure on the root of the second molar or signs of a cyst; the patient has not experienced any episode of pericoronitis in the last two years.
An asymptomatic impacted wisdom tooth in patients over 26 is also often left under observation: in adults, eruption is highly unlikely, and the risk of surgical intervention in the absence of symptoms may be higher than the risk from the tooth itself. The position of the Spanish Ministerio de Sanidad and most European professional associations is that prophylactic removal of asymptomatic wisdom teeth in adults over 25 lacks sufficient evidence. A control panoramic X-ray every 2–3 years is a reasonable alternative to immediate surgery.
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Important: "Let's wait a year" is a decision, not a postponement. It requires a specific date for the next image and a clear list of symptoms that, if they appear, warrant an earlier appointment. Observation without a plan is just postponement.
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4. Diagnosis: what you need to know before surgery
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Imaging
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What it shows
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When mandatory
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Periapical X-ray
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Number of roots, curvature, periodontal status, stage of eruption
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Basic minimum before any intervention
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OPTG (panoramic X-ray)
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Position of all four wisdom teeth, follicular cysts, relationship to the mandibular canal and maxillary sinuses
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When planning extraction of multiple teeth or orthodontic preparation
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CT (cone-beam computed tomography)
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3D relationship of roots to the inferior alveolar nerve with 0.1 mm precision; maxillary sinus volume
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Mandatory if on OPTG the roots project over the mandibular canal
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In Barcelona clinics, CT is usually performed on the same day — either on the clinic's own machine or at a nearby diagnostic center. The images are sent to the surgeon in DICOM format and can be transferred to another device by the patient. If you have already undergone tomography of your wisdom teeth elsewhere — take a digital copy: repeated exposure without need is undesirable.
5. How the surgery goes: three scenarios
Scenario 1 — erupted tooth with straight roots
The surgeon administers anesthetic (on the upper jaw — infiltration, on the lower jaw — mandibular block with 4% articaine with 1:100,000 epinephrine). After anesthesia is achieved within 3–5 minutes, an elevator or luxator separates the tooth's circular ligament from the bone, loosens it using rotational movements, and removes it with forceps. The socket is irrigated with chlorhexidine, and 1–2 sutures are placed if necessary. Total operation time with anesthesia — 25–40 minutes.
Scenario 2 — partially impacted or dystopic tooth
After anesthesia, the surgeon makes a gum incision forming a trapezoidal flap, opening access to the crown and the upper third of the roots. If the tooth is pushing against the second molar — it is divided into 2–3 fragments with a bur or piezotome and removed piece by piece, without creating lever pressure on the adjacent tooth. After socket debridement and removal of granulations, sutures are placed (resorbable Vicryl or nylon 3-0, removal in 7–10 days). The operation takes 35–70 minutes depending on the depth and curvature of the roots.
Scenario 3 — coronectomy (for high risk to the nerve)
If CT shows that the roots of the lower wisdom tooth tightly envelop the inferior alveolar nerve, Spanish surgeons are increasingly resorting to coronectomy — intentional removal of only the tooth crown, leaving the roots in situ. The frequency of paresthesia with this method decreases from 4–8% (with standard extraction in the risk group) to 0.5–1%. The roots migrate apically over time, moving away from the nerve — in 80% of patients after 3–5 years they have descended enough that, if necessary, extraction can be safely completed.
6. Healing dynamics: what is normal and what is not
The most common reason for anxious calls to the clinic after wisdom tooth extraction is not knowing the normal picture. The table below provides guidelines to assess the situation on your own.
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Period
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Normal
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Alarm sign
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Days 1–2
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Aching pain relieved by ibuprofen. Cheek swollen. Mouth opening limited due to swelling of masticatory muscles — trismus. Saliva may be slightly blood-tinged.
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Bleeding does not stop for more than 90 minutes. Acute increasing pain from the first hours, not relieved by analgesics.
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Days 3–4
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Swelling peaks, then begins to subside. Pain decreases. Slight bruising on the cheek or neck is normal for deep extractions.
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Pain increases. A putrid odor emanates from the socket, which looks empty and gray — dry socket. Temperature above 38 °C.
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Days 5–7
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Suture removal (nylon). Mouth opening returns. Pain is minimal or gone. Gum begins to close the socket.
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Numbness of the lower lip or chin persists for more than 72 hours — nerve paresthesia, consultation needed.
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Weeks 2–4
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Socket covered by mucosa. Chewing restored. Slight sensitivity when pressing with the tongue — normal.
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Fistula on the gum with discharge. Persistent swelling — possible suppuration.
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Months 1–3
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Bone regeneration underway. Complete alveolar volume recovery in 3–6 months. Subjectively: no discomfort.
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Pain when pressing on the former socket area — rule out osteomyelitis.
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7. Dry socket: 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 extracted in a hard-to-reach area with poorer blood supply and greater difficulty ensuring a sterile field. 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 nerve endings, and pain sharply increases on days 2–4 instead of subsiding.
Treatment is only medical: the socket is thoroughly irrigated with warm saline or chlorhexidine, then iodoform gauze is placed or bioactive collagen films (Alvogyl — widely used in Spanish clinics) are applied. Dressing changes are repeated every 2–3 days until pain completely subsides. Self-treatment with honey, salt, baking soda, or clove oil does not solve the drainage issue and additionally irritates the mucosa. Systemic antibiotics for dry socket are prescribed only if there are signs of infection (fever, infiltrate) — dry socket itself is not an infectious complication.
8. List of prohibitions: the first three days
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What is strictly prohibited after wisdom tooth extraction (first 72 hours):
✗ Rinsing the mouth vigorously — washes out the clot and provokes dry socket
✗ Smoking — nicotine increases the risk of dry socket 3.5 times (data: J Oral Maxillofac Surg, 2020)
✗ Drinking through a straw — negative pressure dislodges the clot
✗ Applying heat to the face (sauna, hot shower on the face, compress) — provokes swelling and bleeding
✗ Consuming alcohol in the first 48 hours — incompatible with metronidazole, increases bleeding
✗ Touching the socket with tongue, toothpick, or cotton swab
✗ Taking aspirin as a painkiller — thins the blood
✓ Allowed: gently rinse with chlorhexidine after 24 hours (carefully, without force), soft food, external cold
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9. Wisdom tooth pain: tactics before visiting the doctor
Acute pain during wisdom tooth eruption or pericoronitis is inflammatory pain, so the best choice for pain relief is medications with an anti-inflammatory component. Ibuprofen 400 mg is the first line for adults without gastrointestinal contraindications. The interval should be 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.
Topically: rinsing with 0.12% chlorhexidine (Perio-Aid or Oraldine Perio — the standard choice of Catalan dentists) reduces the bacterial load under the operculum and reduces mucosal inflammation. For pronounced cheek swelling, a cold compress externally (ice pack wrapped in cloth, 15 minutes per hour) provides a noticeable effect in the first 12 hours. All these measures are temporary. They relieve the acute episode but do not affect the cause: as long as the tooth erupts incorrectly or the operculum is present, inflammation will return.
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Emergency care in Barcelona for acute tooth pain:
• On weekdays: most private clinics see urgencias (walk-in) — call ahead
• Weekends and holidays: guardia dental — Barcelona's emergency dental service
• List of emergency clinics: coedib.com or the Col·legi de Dentistes de Catalunya mobile app
• Emergency (112) — only for neck swelling, difficulty breathing, or temperature above 39 °C
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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 (teeth on the opposite jaw) in most cases will also be extracted or are initially absent. However, if the patient does not have the second molar and the wisdom tooth was the only chewing tooth in that quadrant — after its extraction, implantation or a removable denture is advisable. The decision is made based on an orthopantomogram and orthodontic consultation.
The situation with bone atrophy deserves special attention. If the patient is planning an implant in the area of the second molar and the wisdom tooth is adjacent, the surgeon may perform the extraction and simultaneously carry out socket augmentation — filling the socket with bone graft (Bio-Oss, MinerOss) with a membrane. This preserves the bone ridge volume necessary for implant placement in 3–4 months and avoids a separate complex bone augmentation procedure in the future.
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Key takeaways from the article:
• Extraction is necessary for pericoronitis, pressure on the second molar, cyst, inaccessible caries. It is not necessary if the tooth has taken the correct position and can be cleaned normally.
• CT before lower wisdom tooth extraction when close to the nerve is not a whim, but a safety standard.
• The three main prohibitions after surgery: no smoking, no active rinsing, no heat — that's 90% of dry socket prevention.
• Pain increasing on day 3–4 instead of decreasing + odor = dry socket. You need a dressing placed by 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
1. Ghaeminia H. et al. Position of impacted third molars in relation to the mandibular canal. J Oral Maxillofac Surg, 2014.
2. Cervera-Espert J. et al. Coronectomy of the mandibular third molar: a meta-analysis. Med Oral Patol Oral Cir Bucal, 2016.
3. Bouloux GF et al. Complications of third molar surgery. Oral Maxillofac Surg Clin North Am, 2007.
4. COEM. Posición sobre exodoncia profiláctica de terceros molares. Colegio de Odontólogos, Madrid, 2019.
5. Clinical recommendations "Difficult eruption of wisdom teeth". StAR, 2021.
6. Adeyemo WL. Do pathologies associated with impacted lower third molars justify prophylactic removal? Oral Surg Oral Med, 2006.
