Why a Tooth Becomes Impacted and How Dentists Find It

Maybe your dentist pointed to a shadow on an X-ray and said a tooth is “stuck.” Or maybe you feel a dull ache at the back of your jaw when you chew. Either way, you may be dealing with an impacted tooth.

An impacted tooth is one that is blocked from erupting normally into the mouth, often because there is not enough space or another tooth is in the way. It may cause no symptoms at all. Still, dental monitoring or treatment can help prevent pain, infection, tooth damage and other complications.

Overview: What Is an Impacted Tooth?

When a tooth’s path is blocked, it doesn’t come through fully within its usual time frame. The tooth may remain completely under the gum and bone, or it may partly emerge through the gum. This is a common dental finding, particularly in late adolescence and adulthood, and it does not always cause immediate discomfort.

Teeth need adequate space and a clear path to move into their normal position. When the jaw is too small, a neighboring tooth blocks the route, or the tooth develops at an unusual angle, eruption may stop. Dentists often identify an impacted tooth during a routine examination or on an X-ray before symptoms develop.

Third molars, commonly called wisdom teeth, are most frequently impacted because they are the last adult teeth to develop and erupt. Upper canine teeth can also become impacted. Canines matter a lot for how your bite lines up and how your smile looks, so we check their position carefully, especially in children and teenagers.

How an Impacted Tooth May Feel and Look

Some impacted teeth cause no noticeable symptoms. A fully buried tooth may be discovered only when dental imaging is taken for another reason. For this reason, regular dental visits are useful even when the mouth feels healthy.

When a tooth partly erupts, a flap of gum may cover part of its crown. Food and bacteria can collect beneath this tissue, leading to inflammation around the tooth. Possible symptoms include tenderness at the back of the jaw, swollen or reddened gums, bad breath, an unpleasant taste, jaw stiffness, or discomfort when chewing.

An impacted tooth may also contribute to crowding, pressure on adjacent teeth, or a visible gap where a tooth would normally be expected. In some cases, a cyst can form around an unerupted tooth or a nearby tooth can develop decay or gum disease because cleaning the area is difficult. None of this is bound to happen, but it is why we like to take a look sooner rather than later.

• Intermittent gum pain or swelling near a partially erupted tooth
• Food trapping or difficulty cleaning at the back of the mouth
• Repeated inflammation or infection around the gum tissue
• Pressure, crowding, or changes in the position of nearby teeth

Why Teeth Become Impacted

Tooth impaction usually results from a combination of anatomy, tooth development and available jaw space. Wisdom teeth are especially likely to be affected when there is not enough room behind the second molars for them to emerge upright. They may angle forward, backward, sideways, or remain positioned deep in the jawbone.

Genetics can influence jaw size, tooth size and the timing of tooth development, which may help explain why impacted teeth can occur in families. Early or late loss of baby teeth, crowded teeth, abnormal tooth position, and certain developmental differences can also alter the path of an adult tooth.

For impacted canine teeth, the cause may involve crowding, a baby tooth that remains in place too long, or an adult canine that has developed away from its normal eruption route. A dentist may monitor how permanent teeth are developing in childhood so that early treatment, such as removing a retained baby tooth or creating space orthodontically, can sometimes support normal eruption.

Dental Assessment and Diagnosis

A dentist diagnoses an impacted tooth by combining an oral examination with dental imaging. During the examination, the dentist checks for missing or partially erupted teeth, gum inflammation, signs of crowding, and the condition of neighboring teeth. The person’s symptoms and history of recurrent swelling or discomfort are also important.

Dental X-rays show whether a tooth is present, its angle and depth, the shape of its roots, and its relationship to nearby teeth, bone, nerves and sinus spaces. A panoramic X-ray is frequently used to view the jaws and teeth together. In selected situations, three-dimensional imaging may be used when more detailed information is needed for treatment planning.

Every mouth is different, so the assessment is too. The dentist or oral and maxillofacial surgeon considers whether the tooth is likely to erupt, whether it can be kept healthy, whether it is harming nearby structures, and whether treatment risks outweigh the benefits. That way you avoid procedures you don’t need, and we still catch the problems that do need care.

Treatment Options for an Impacted Tooth

Treatment depends on the type of tooth, its position, symptoms, age, oral health and the effects on surrounding structures. If an impacted tooth is fully buried, symptom-free and not causing damage, a dentist may recommend periodic clinical and X-ray monitoring. Monitoring allows changes to be identified early without immediate surgery.

Partially erupted wisdom teeth that repeatedly become inflamed, develop decay, damage adjacent teeth, or cannot be cleaned adequately may need extraction. Removal is typically performed by a dentist with surgical experience or an oral and maxillofacial surgeon. Local anesthesia is commonly used, and sedation options may be discussed when appropriate for the individual and procedure.

For an impacted canine or another tooth that is valuable for bite function, the aim may be to guide it into position rather than remove it. This can involve orthodontic treatment to create space, a minor surgical procedure to expose the tooth, and an orthodontic attachment that gradually moves it into the dental arch. If the tooth cannot be moved safely or is significantly affected, removal and a plan to restore the space may be considered.

After a procedure, the dental team provides instructions on pain control, eating, oral hygiene and follow-up. Healing experiences vary, but worsening pain after initial improvement, persistent bleeding, fever or increasing swelling should be reported promptly. Acıbadem Health Point’s multidisciplinary dental and oral surgery specialists in JCI-accredited hospitals can assess and treat impacted teeth for international patients when specialist care is needed.

Prevention and Everyday Self-care

It is not always possible to prevent tooth impaction because jaw shape and tooth development are largely determined by biology. However, routine dental checkups help detect erupting problems before they lead to pain, infection or damage to nearby teeth. Dental visits during childhood and adolescence are particularly useful for observing the development of permanent teeth.

Good daily oral hygiene protects the teeth and gums around a partially erupted tooth. Brushing twice daily with fluoride toothpaste, cleaning between teeth as advised by a dental professional, and attending regular professional cleanings can reduce the buildup of plaque. A small-headed toothbrush or interdental cleaning aid may help reach difficult areas, but it should be used gently to avoid injuring the gum.

Home care can take the edge off minor discomfort, but it won’t fix an impacted tooth. Warm salt-water rinses may soothe irritated gums, and a dentist or pharmacist can advise on appropriate over-the-counter pain relief for an individual. People should avoid placing aspirin or other medications directly on the gum, as this can irritate or burn oral tissues.

When to Seek Medical Care

A dental appointment should be arranged if there is ongoing pain, swelling, recurrent gum inflammation, a bad taste, difficulty cleaning a partially erupted tooth, or concern that a permanent tooth has not appeared as expected. Early evaluation can clarify whether observation, orthodontic treatment or extraction is the most suitable option.

Urgent dental or medical care is important for facial swelling that is spreading, fever, pus, severe pain, difficulty opening the mouth, trouble swallowing, or breathing difficulty. These symptoms can indicate a significant infection and should not be managed with home remedies alone. Anyone with breathing difficulty should seek emergency care immediately.

People who are pregnant, have diabetes, take medicines that affect immunity or bone health, or have a condition that increases infection risk should inform their dental team. Telling us helps us plan your imaging, anesthesia, medicines and follow-up safely.

Frequently asked questions