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A decayed wisdom tooth should always be examined by a dentist: depending on the condition of the tooth, they will choose to treat it (filling or root canal treatment) or extract it. While waiting for your appointment, you can relieve the pain with simple measures, but no home remedy replaces treatment. This guide explains how to recognize decay on a wisdom tooth, when to seek urgent care, the treatment options and how to prevent it from recurring.
Key points
- Decay on a wisdom tooth can never be treated on its own: it requires a dental assessment because the tooth is difficult to access and the infection can worsen.
- There are two possible outcomes depending on the case: preserve the tooth (filling or root canal treatment) or extract it, particularly if it is impacted, poorly positioned or too damaged.
- Fever, cheek swelling, throbbing pain or difficulty opening the mouth are emergency signs: seek care without delay.
- Cloves, salt-water mouthwash and cold only provide temporary relief while waiting to see the dentist.
- Prevention involves thorough cleaning of the back area, supplemented by a water flosser to dislodge what the toothbrush leaves behind.
What is a decayed wisdom tooth?
Wisdom teeth are the last molars, located at the very back of the mouth. When they are partially impacted, only part of the crown emerges from the gum: this area is both difficult to see and difficult to brush. Food debris and bacteria then accumulate between the gum and the partially erupted tooth, which accelerates the development of decay.
This position at the back of the dental arch also explains why decay on a wisdom tooth is often more complicated to treat than on another tooth: access for the dentist is limited, and the neighboring tooth (the second molar) may also be affected. This is why early treatment helps prevent many complications.
To learn everything about these molars - eruption, role and preventive extraction -, consult our complete guide to the wisdom tooth.
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The main causes of a decayed wisdom tooth
1) The tooth's natural fragility
Some teeth are naturally more resistant to tooth decay than others: it partly depends on dental genetics. Enamel is highly resistant to decay, whereas the dentin in the roots is much less so. That is why, as we age, when the gums recede, decay often reappears on exposed roots.
2) A diet that is too sugary or acidic
Sugar and acid damage tooth enamel. Soft drinks, carbonated beverages, and many sauces are particularly high in them. Frequent consumption of sugary foods therefore significantly increases the risk of cavities, sometimes as early as adolescence. Conversely, a diet based on minimally processed foods helps preserve dental health.
3) Insufficient oral hygiene
Bacteria feed on sugar and produce acid. On their own, they are not very harmful; but over time, they clump together and form plaque, which concentrates the acid that dissolves tooth enamel. Careful tooth brushing, supplemented with dental floss, remains the safest way to prevent tooth decay, including on wisdom teeth.
Symptoms: how to recognize a cavity in a wisdom tooth
An impacted wisdom tooth may remain asymptomatic for a long time. When symptoms appear, the most common signs are:
- red or swollen gums around the tooth;
- gum pain around the wisdom tooth;
- pain, sometimes severe, in the jaw;
- swelling of the cheek or jaw;
- an unpleasant taste in the mouth, accompanied by bad breath;
- sensitivity to hot, cold, or sweet foods affecting the wisdom tooth or the neighboring tooth.
These symptoms may indicate anything from a simple early-stage cavity to more advanced damage. Only a dentist can tell the difference, which is why it is important to seek advice as soon as the first signs appear.
When should you seek urgent care?
A decayed wisdom tooth always requires a dental consultation, but certain signs mean you should not wait. They may indicate an infection that is spreading, such as an abscess or pericoronitis (inflammation of the gum that partially covers the tooth).
According to the French Health Insurance system, an untreated dental infection can develop into an abscess and, more rarely, spread to other parts of the body. While waiting to be seen, a painkiller such as paracetamol may help; it is best to avoid aspirin in the event of bleeding and seek advice from a pharmacist or doctor.
Treat or extract: treatment options
The choice of treatment depends on the condition of the tooth, its position, and whether or not an infection is present. The dentist decides after an examination, often including an X-ray. There are three main options.
Filling (restoration)
When the decay is limited and the tooth is accessible, the dentist removes the decayed part and fills the cavity with composite. This is the most conservative solution, allowing the tooth to be preserved.
Devitalization
If the decay has reached the nerve, root canal treatment (devitalization) can be performed to preserve the tooth, provided its access and position allow it.
Extraction
When the tooth is too damaged, impacted, poorly positioned or impossible to treat properly, extraction becomes the most reliable solution for preventing recurrence and protecting neighboring teeth.
Does a decayed wisdom tooth always have to be extracted?
No, not systematically. A properly positioned, functional wisdom tooth with an accessible cavity can often be treated and preserved. However, extraction is frequently preferred for wisdom teeth because they are difficult to treat and clean over the long term. When the adjacent second molar is also decayed and the wisdom tooth is too close, it may sometimes be necessary to extract the latter in order to treat the molar properly.
How is the extraction performed?
Wisdom tooth extraction is most often performed under local anesthesia as an outpatient procedure. If you are apprehensive or the procedure is complex, general anesthesia is possible; this then requires a short hospital stay and a prior anesthesiology consultation.
- The dental surgeon makes an incision in the gum to access the tooth.
- They expose the tooth, sometimes by drilling away the surrounding bone or cutting the tooth into several pieces.
- The tooth is removed, generally in a single appointment.
- The gum is closed with dissolvable stitches that disappear within a few weeks.
The procedure generally takes no more than about thirty minutes. It is mainly the days that follow that require precautions.
Aftercare following extraction: avoiding complications
Adapt your diet
Changing your diet does not directly relieve pain, but it prevents it from getting worse. For the 2 to 3 days following the extraction, choose soft, liquid and cold foods. In the days afterward, reintroduce lukewarm and slightly more substantial foods before gradually returning to a normal diet.
Apply cold
Within the next 24 hours, applying an ice pack to the cheek helps soothe the toothache and reduce swelling. If you don't have one, ice cubes wrapped in a cloth and applied for 15 to 20 minutes will do the trick.
Relieving pain while waiting for your appointment
These measures do not treat the cavity but may provide relief while waiting for your appointment.
Clove
Clove is known for its antiseptic, anti-inflammatory and pain-relieving properties. Crush one between your fingers and apply it to the painful area for a few minutes while waiting for your dental appointment.
Salt water mouthwash
Salt has a decongestant effect that can help when the gum is red and swollen. Boil a cup of water, let it cool until lukewarm, then dissolve a tablespoon of coarse salt in it. You can repeat this mouthwash several times a day to reduce inflammation.
How much does treatment for a decayed wisdom tooth cost?
The cost depends on the treatment chosen by the dentist. A filling is one of the least expensive conservative treatments and is partially covered by the French national health insurance system. Root canal treatment costs more because it requires several stages. Extraction costs vary depending on whether the tooth is easy to remove or impacted: surgical extraction, which is more complex, costs more than a standard extraction.
Prices are indicative and vary depending on the practitioner, region and insurance coverage. Always request a quote from your dentist before the procedure: only they can accurately estimate the cost of the appropriate treatment for your decayed wisdom tooth.
Preventing cavities on wisdom teeth
Since wisdom tooth decay is mainly caused by the difficulty of cleaning the back of the mouth, prevention relies on thorough cleaning of this area.
- Brush at least twice a day, paying particular attention to the last molars without pressing too hard on the gums.
- Use dental floss or interdental brushes to reach the spaces between the back teeth.
- Use a water flosser to dislodge debris trapped where the toothbrush cannot reach.
- Limit sugar and acidic drinks, and have your teeth checked regularly.
For thorough, regular brushing, the Y-Brush Ultra sonic toothbrush cleans both jaws in just a few seconds and offers several vibration modes suited to different sensitivity levels. In addition, the Hydro Go water flosser helps clean hard-to-reach areas around the wisdom teeth.
