Acute periodontal conditions: from emergency management to definitive care

Acute periodontal conditions are less common than chronic gingivitis and periodontitis, but their clinical impact can be considerable. They may present with pain, infection, and rapid tissue destruction, and some cases can be accompanied by systemic involvement. According to the 2018 World Classification of periodontal diseases and conditions, the three main acute periodontal conditions are necrotizing periodontal diseases, periodontal abscesses, and acute manifestations of endodontic-periodontal lesions (EPLs).

The new EFP S2k-level clinical practice guideline (CPG) was developed to turn the available evidence into practical decisions at the chairside. Two commissioned systematic reviews informed the process, followed by structured discussion and voting at the 21st European Workshop on Periodontology, held at La Granja de San Ildefonso (Spain) in November 2025. Because direct evidence is limited for several acute conditions, the guideline is also transparent about where recommendations rely on expert consensus.

One pathway, three different emergencies

Across all three conditions, the same sequence runs through the guideline. First, confirm the diagnosis and relevant subtype. Second, control the acute condition—pain, infection, and continuing tissue destruction—using the least invasive effective intervention. Third, once the emergency has settled, manage the underlying disease, local aetiological factors, or patient-related predispositions.

That separation between emergency care and definitive treatment is important. It avoids doing too much during the most inflamed phase, clarifies when antibiotics are and are not justified, and creates a natural point for reassessment.

1. Necrotizing periodontal diseases: control the lesion, then the context.
   
   Necrotizing gingivitis and necrotizing periodontitis are both characterized by papillary necrosis or ulceration, bleeding, and pain, while rapid bone loss distinguishes necrotizing periodontitis. If no obvious immune compromise is present, the clinician should actively look for relevant predisposing factors.
   
   For patients with temporary or moderate immune compromise, the first-line intervention is careful mechanical instrumentation, preferably with sonic or ultrasonic instruments, to reduce the microbial burden while minimizing tissue trauma. Short-term antiseptic mouth rinses, such as chlorhexidine or hydrogen peroxide, may be used while normal plaque control is difficult. Oral hygiene should remain gentle during the acute phase, and pain should be managed without opioids.
   
   The guideline suggests review after 48-72 hours. Once the acute lesion has resolved, attention shifts to the pre-existing gingivitis or periodontitis, modifiable factors (such as smoking, nutrition, and stress), and any residual soft-tissue sequelae.

2. Periodontal abscesses: drainage before definitive instrumentation.
   
   For periodontal abscesses, the central recommendation is straightforward: drainage is first-line treatment. Whenever feasible, drainage should be achieved through the periodontal pocket. This relieves pressure, reduces pain, and helps control destructive activity.
   
   The guideline advises against mechanical instrumentation to the bottom of the periodontal pocket during the acute phase because viable periodontal ligament may still be present at the apical portion of the lesion. Definitive subgingival instrumentation belongs to the subsequent phase, once the abscess has subsided; the guideline notes that this is typically not until about 10-12 days from onset.
   
   An early review after 48-72 hours is recommended. At the subsequent stage, underlying periodontitis should be treated according to current guidelines and contributing factors—such as foreign-body impaction, gingival enlargement, orthodontic factors, or alterations of the root surface—should be corrected.

3. Endodontic-periodontal lesions: diagnosis and sequence matter
   
   EPLs can be diagnostically demanding because pulp and periodontal tissues communicate and more than one pathology may be present. Deep periodontal pockets extending towards the apex and an altered or negative response to pulp testing are key diagnostic findings. Root fractures, cracks, perforations, and external root resorption must also be considered because they can change the prognosis.
   
   When an acute EPL is driven by partial or complete pulp necrosis and the tooth is treatable, root-canal treatment should be the first step. If an abscess is present, drainage—preferably through the periodontal pocket and/or by incision—should be performed, followed by endodontic treatment. Immediate deep subgingival instrumentation is not recommended when an EPL presents with an abscess.
   
   For non-acute communicating EPLs, the guideline suggests completing root-canal treatment first, allowing healing and reassessing after at least three months before treating a residual periodontal pocket. If a deep pocket of 6mm or more persists after endodontic and non-surgical periodontal therapy, periodontal surgery may then be considered.