A persistent, deep ache at the back of your jaw can be both unsettling and exhausting. If you have been searching online for answers, you are not alone — thousands of adults in London look for information about toothache from an impacted tooth every month, hoping to understand what is happening beneath the gum line and what can be done about it.
An impacted tooth is one that has failed to emerge fully into its expected position, most commonly affecting wisdom teeth (third molars) during late adolescence or adulthood. Because the tooth remains partially or completely trapped within the jawbone or soft tissue, it can create pressure, inflammation and pain that radiates across the face.
This article explains the key signs that may suggest an impacted tooth, the underlying dental science, the treatment approaches a dentist may consider, and practical steps you can take to look after your oral health.
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What Is a Toothache from an Impacted Tooth?
A toothache from an impacted tooth occurs when a tooth — most often a lower wisdom tooth — is unable to erupt properly through the gum and instead presses against neighbouring teeth, bone or soft tissue. This pressure can trigger persistent or intermittent pain that ranges from a dull background ache to sharp, throbbing discomfort.
The pain is typically caused by one or more of the following:
- Mechanical pressure on adjacent teeth as the impacted tooth attempts to push through
- Pericoronitis — inflammation or infection of the gum tissue that partially covers the unerupted tooth
- Cyst formation around the impacted tooth within the jawbone
- Decay developing on the impacted tooth or on the neighbouring second molar, where cleaning is difficult
Common Signs and Symptoms to Be Aware Of
- Jaw pain or aching — often felt at the back of the mouth on one or both sides, sometimes radiating towards the ear or temple
- Swollen, red or tender gums — particularly around the area where the tooth is trying to emerge
- Difficulty opening the mouth fully — known as trismus
- An unpleasant taste or bad breath — this may indicate that bacteria are accumulating around a partially erupted tooth
- Pain when chewing or biting — the pressure of eating can aggravate inflamed tissue
- Swelling in the cheek or jaw area
The Dental Science Behind Tooth Impaction
Each tooth forms inside the jawbone within a structure called a dental follicle — a sac of tissue that guides the tooth as it moves towards the gum line. In a straightforward eruption, the tooth travels along a clear path, breaks through the bone and gum tissue, and settles into alignment with the rest of the dental arch.
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When the tooth cannot complete its eruption, several problems can follow:
- The dental follicle may enlarge and form a dentigerous cyst, which can gradually erode surrounding bone
- The gum flap (operculum) covering a partially erupted tooth traps food debris and bacteria, creating a breeding ground for infection
- The impacted tooth may press against the roots of the second molar, potentially causing resorption of that tooth's root structure
How Is an Impacted Tooth Diagnosed?
A dentist will typically begin with a thorough clinical examination of the mouth. Because much of the impacted tooth may be hidden beneath bone or soft tissue, dental imaging plays a crucial role.
- Periapical X-rays — small, targeted films that show the tooth and surrounding bone in detail
- Panoramic radiographs (OPG) — a single image capturing the entire jaw
- Cone-beam computed tomography (CBCT) — a three-dimensional scan for complex cases
Treatment Approaches for an Impacted Tooth
Conservative Management
If the impacted tooth is not currently causing significant problems, a dentist may recommend a monitoring approach with regular clinical reviews and periodic X-rays.
Management of Pericoronitis
When the gum tissue around a partially erupted tooth becomes inflamed or infected, initial treatment typically focuses on managing the infection through professional irrigation, home cleaning advice, and antibiotics if necessary. Repeated episodes may indicate that surgical removal of the wisdom tooth could be the most appropriate long-term solution.
Surgical Extraction
Surgical removal is the most common definitive treatment for a symptomatic impacted tooth. The procedure is typically carried out under local anaesthesia, though sedation options may be available. During the procedure, the dentist or oral surgeon will make a small incision in the gum tissue, remove a small amount of bone if necessary, section the tooth into smaller pieces if needed, and clean and close the site with dissolvable stitches.
Recovery times vary, but most patients can expect some swelling and discomfort for several days following surgery.
When Professional Dental Assessment May Be Needed
- Pain that persists for more than two or three days despite over-the-counter pain relief
- Swelling that is worsening or spreading to the cheek, under the jaw, or around the eye
- Difficulty swallowing or breathing — this is uncommon but requires prompt attention
- A fever or feeling generally unwell alongside dental pain
- Pus or discharge from the gum area around the back teeth
- Difficulty opening the mouth more than a couple of centimetres
Prevention and Oral Health Advice
Attend regular dental check-ups. Routine examinations and X-rays allow your dentist to monitor developing wisdom teeth and identify potential impactions before symptoms arise.
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Maintain thorough oral hygiene. Brushing twice daily with fluoride toothpaste and cleaning between teeth with interdental brushes or floss helps reduce bacteria around partially erupted teeth.
Use an antiseptic mouthwash. If you know you have a partially erupted wisdom tooth, a chlorhexidine-based mouthwash (used short-term on dental advice) can help manage bacterial levels.
Rinse gently with warm salt water. If mild irritation develops around a wisdom tooth, gentle salt water rinses can provide temporary comfort.
Key Points to Remember
- A toothache from an impacted tooth is most commonly caused by a wisdom tooth that cannot fully erupt through the gum
- Symptoms may include jaw pain, gum swelling, difficulty opening the mouth, and an unpleasant taste
- Not all impacted teeth cause problems — some are discovered incidentally on X-rays and may only need monitoring
- Treatment options range from conservative management and infection control to surgical extraction
- Persistent pain, spreading swelling, or signs of infection are reasons to seek a professional dental assessment
- Regular dental check-ups and good oral hygiene are the most effective ways to reduce the risk of complications
Frequently Asked Questions
Can an impacted tooth cause pain even if it is not infected?
Yes. An impacted tooth can cause discomfort through mechanical pressure alone, even without infection. As the tooth pushes against neighbouring teeth or bone, it can create a deep, aching sensation. Pericoronitis — inflammation of the gum tissue — can also cause pain without a full-blown infection being present.
Is it always necessary to remove an impacted wisdom tooth?
Not necessarily. If an impacted wisdom tooth is not causing symptoms and is not associated with any pathology, a dentist may recommend regular monitoring rather than immediate extraction. The decision to remove a wisdom tooth is based on individual clinical findings.
How long does recovery take after impacted tooth removal?
Recovery varies depending on the complexity of the extraction and individual healing factors. Most patients experience the greatest swelling and discomfort during the first two to three days, with gradual improvement over one to two weeks. Soft foods, gentle oral hygiene, and following your dentist's aftercare instructions can support healing.
Can an impacted tooth affect other teeth?
Yes, in some cases. An impacted tooth — particularly one angled towards the adjacent second molar — can exert pressure on that tooth's root, potentially leading to root resorption over time. It can also create hard-to-clean areas where decay may develop on the neighbouring tooth.
Are impacted teeth more common at certain ages?
Impacted wisdom teeth most commonly become symptomatic between the ages of 17 and 30, as this is when the third molars typically attempt to erupt. However, impacted teeth can cause problems at any age. Some patients first experience symptoms in their 40s or 50s.
Conclusion
A toothache from an impacted tooth is a common dental concern that affects many adults, particularly in relation to wisdom teeth. Understanding the signs — from persistent jaw pain and gum inflammation to difficulty chewing — can help you recognise when it may be time to consult a dental professional.
Treatment options are varied, ranging from careful monitoring and infection management through to surgical extraction, and the right approach depends entirely on your individual circumstances. The good news is that with timely assessment and appropriate care, the discomfort associated with impacted teeth can typically be managed effectively.
Dental symptoms and treatment options should always be assessed individually during a clinical examination.