Symptoms, examination and treatment choices.
A dental abscess is a collection of pus formed due to an infection near the tooth root or in the surrounding tissues. It can cause severe pain, swelling of the gums or face, but sometimes only a small pus-filled bump on the gums is noticed. A decrease in pain does not necessarily mean the infection has disappeared.
If an abscess is suspected, seek an urgent dental examination. The aim of treatment is to remove the source of infection and allow the pus to drain. Painkillers or mouth rinses alone do not solve this problem. Whether the tooth can be saved depends on the extent of its damage and the condition of the surrounding tissues.
One cause is deep tooth decay, through which bacteria reach the pulp inside the tooth. When the pulp dies, the infection can travel through the root canals into tissues beyond the root tip. A similar situation can arise after a tooth injury, cracks, or a poorly sealed restoration. A tooth may have been filled many years ago and still become a source of infection.
An abscess can also form beside the tooth, deep in a gum pocket. In this case, the problem is related to the supporting tissues of the tooth rather than its root canals. Inflammation around a partially erupted wisdom tooth is also considered separately. Similar external swelling can have different causes, so the same treatment is not suitable for all patients.
Often one tooth hurts, it is uncomfortable to bite or touch it. It may seem to be ‘higher’ and the first to contact the opposing tooth. The gums become red, swollen, sometimes an unpleasant taste appears or pus discharges. Pain can spread to the jaw and be difficult to localize.
It is important to pay attention to overall wellbeing: whether there is a fever, increasing facial swelling, or difficulty opening the mouth. Not all these signs may be present at the same time. Absence of fever does not prove the infection is harmless, and severe pain without swelling does not confirm an abscess—this can also occur with pulpitis.
A small lesion from which pus sometimes appears may be a fistula opening. This is a passage through which secretions from the infection site enter the mouth. When pressure decreases, pain may subside, creating the impression that the problem has passed. However, the source of infection in or near the tooth may remain.
Do not press or puncture the lump. Schedule an examination even if it disappears and reappears. If the lesion is not visible at the time, a previously taken image may be helpful for the doctor. It is important to inform whether root canal treatment was previously done at that site, whether the tooth experienced trauma, and when the change was first noticed.
During the examination, not only the painful tooth but also adjacent teeth, gums, and the swollen area are assessed. The dentist may test the tooth’s response to cold, sensitivity to tapping, mobility, and the depth of gum pockets. These data help distinguish infection starting in the canals from other problems.
An X-ray image shows the tooth roots, previous root canal treatment, and some changes in the surrounding bone. In early stages, all changes may still be invisible on the image, so the diagnosis is based on the entire examination data. If previous examinations exist, it is worth bringing them. Additional imaging tests are ordered when needed for a specific decision.
If the infection originated in the tooth canals and the tooth can be restored, root canal treatment is performed. The canals are cleaned, disinfected, and later filled. Previously treated teeth may require retreatment of canals or other endodontic procedures. Afterwards, it is important to restore the tooth tightly.
When pus has accumulated in soft tissues, the doctor will perform an incision and drainage if necessary. If the abscess is associated with a gum pocket, periodontal tissues are treated. Severely decayed, non-restorable teeth may not be saved — in such cases, removal is discussed. The decision is made based on the tooth’s condition, not solely on pain intensity.
The first visit is sometimes dedicated to urgent care. After pain subsides, the planned treatment must be completed: a temporary filling or an open infection site is not the final restoration of the tooth.
No. When the infection is localized, the patient has no health conditions that worsen it, and the necessary local treatment can be performed immediately, antibiotics are often not needed. The primary treatment is the removal of the infection source. Antibiotics do not clean the root canals and do not replace drainage.
They may be prescribed if the infection spreads, general symptoms occur, or due to other circumstances assessed by the doctor. The condition of the immune system and the possibility of timely procedure are also important for the decision. Do not use leftover antibiotics at home or choose them based on a previous prescription. If medications are prescribed, follow exactly the instructions given to you and agree on a follow-up evaluation.
Contact the clinic promptly and inform whether your face is swelling, if you have a fever, or difficulty opening your mouth. Eat softer food, avoid chewing on the painful side, clean your teeth gently. Avoid foods or drinks that increase pain. Take pain relief medication only if it is suitable for you, according to the package leaflet or the doctor’s instructions.
Do not place medication tablets directly on the gums, heat the swollen area, or try to drain the pus yourself. If swelling rapidly increases, seek urgent medical assessment. If breathing, swallowing or speaking becomes difficult, call 112 immediately for emergency help. Do not wait for a scheduled dental consultation.
Before leaving the clinic, find out when the next visit is scheduled, how to care for the treated area, and whom to contact if your condition worsens. If pain or swelling increases or new symptoms appear, inform the doctor. Taking medication is not a reason to delay a follow-up examination.
Later, daily dental and interdental care, as well as treatment of caries and gum diseases, are important. The condition of the tooth treated in the canals is assessed during control visits. Well-being may improve sooner than surrounding tissues fully recover, so the treatment outcome is not evaluated only by the disappearance of pain.
Pus sometimes drains and the pain decreases, but this does not eliminate the source of infection. The tooth or gums still need to be examined and treated.
Yes. Especially when discharge drains through a fistula. A recurring lump on the gums or pus formation is a reason to schedule an examination even if there is no pain.
Not always. If the tooth can be reliably restored, root canal treatment or retreatment is considered. Extraction is necessary when the possibilities of saving the tooth are insufficient.
They may be needed under certain circumstances, but do not replace dental treatment. Even if swelling decreases, it is important to eliminate the source of infection and complete the planned procedures.
If an abscess is suspected, a wait-and-see approach should be discussed with a dentist and not decided independently. Increasing swelling, fever, or worsening general condition must be evaluated urgently.
It depends on the source of infection and chosen treatment. Emergency care, root canal treatment, and final tooth restoration may occur during separate visits. The doctor will explain the plan after examination.
Yes. In such a case, previous root canal treatment, the seal integrity of the restoration, possible cracks, and other reasons are evaluated. The mere fact of previous treatment does not explain why inflammation occurred.
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This information is for patient education and does not replace an individual examination, diagnosis or treatment plan.
