Root resorption means the body is slowly removing part of a tooth's root. It is often silent and found on an X-ray. What happens next depends on the type, where it is and how early it was caught.
Bring any recent X-rays or scans and tell us about past injuries, braces or whitening of that tooth.
Root resorption is a process in which the body's own cells break down part of a tooth's root, from inside the canal (internal resorption) or from the outer surface (external resorption). In adult teeth it can follow injuries, orthodontic treatment, infection or pressure from an impacted tooth. It often causes no pain and is found on X-rays. At Creative Arts in Dubai it is assessed with 3D CBCT imaging before treatment is decided.
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Resorption is something the body does on purpose in baby teeth: as an adult tooth grows underneath, the baby tooth's root is dissolved so that it can fall out. In adult teeth the roots are normally protected, on the outside by a thin layer of cementum and ligament, and on the inside by the lining of the pulp. When that protection is damaged, by an injury, an infection or prolonged pressure, the cells that remodel bone can start removing tooth tissue instead.
Root resorption is usually discovered by chance. A routine X-ray shows a dark area along a root, a root that looks shorter than its neighbours, or a rounded hollow in the canal. Most people have had no pain, which makes the finding feel alarming. It does not mean the tooth will be lost; it means the type and extent need to be worked out before deciding what to do.
Dentists name resorption by where it starts and what drives it. The type matters more than anything else for treatment.
| Type | Where it starts | Common background | Typical approach |
|---|---|---|---|
| Internal resorption | Inside the root canal | Long-standing inflammation of the pulp, sometimes after injury | Root canal treatment, which removes the tissue causing it |
| External inflammatory resorption | Outer root surface | A tooth whose pulp has died after injury or decay, with infection inside | Root canal treatment to remove the infection that drives it |
| External cervical resorption | Outer surface near the gum line | Past injury, orthodontic treatment or internal bleaching; sometimes no clear cause | Mapped with CBCT; repair of the defect, root canal treatment, or extraction if too extensive |
| Replacement resorption (ankylosis) | Outer root surface | Severe injury, such as a knocked-out tooth that was replanted | The root is gradually replaced by bone; monitoring, with planning for replacement in time |
| Orthodontic apical shortening | Root tips | Tooth movement during braces or aligners | Usually mild; X-ray monitoring and, if needed, a pause in treatment |
| Pressure resorption | Root surface touched by another tooth | An impacted wisdom tooth or canine pressing on a neighbour | Removing or moving the tooth that causes the pressure |
These are general patterns, and some teeth show more than one type. UK NICE guidance on wisdom teeth lists resorption among the problems that justify removing an impacted wisdom tooth.
Both are recognised causes. Moving teeth with braces or aligners commonly shortens the root tips slightly. A summary in Evidence-Based Dentistry of a systematic review reported that comprehensive orthodontic treatment increases how often and how severely root resorption occurs, that heavy forces may be particularly harmful, and that the evidence supports using light forces, with some evidence that a pause of about two to three months reduces total resorption. In most patients the shortening is minor and the teeth stay healthy. Orthodontists take X-rays during treatment so it can be spotted early; our guide to whether braces loosen teeth explains the normal movement involved.
Injuries matter even when the tooth looks fine afterwards. A blow can damage the ligament around the root or the pulp inside, and resorption may only appear months or years later. That is why injured teeth, especially a knocked-out tooth that was put back, are followed up with X-rays, and why you should mention old injuries at any examination.
Most resorption causes no symptoms until it is advanced. When signs appear, they are usually these.
When resorption hollows out tooth tissue close to the surface, the blood-rich tissue filling the hollow can show through as a pink area. It is classically linked with internal resorption and can also appear with cervical resorption. A pink tooth needs an X-ray soon.
A rounded hollow in the canal suggests internal resorption; an irregular dark area overlapping the canal often suggests external resorption. Ordinary X-rays cannot always tell them apart, which is where CBCT helps. Our guide to reading a dental X-ray explains what the shades mean.
These usually appear late, when infection is present or a lot of root has been lost. A tooth that becomes loose without gum disease, or a gum swelling next to a treated or injured tooth, deserves an X-ray.
Diagnosis starts with a careful history, including injuries, braces, whitening of a dead tooth and previous root canal treatment, and a clinical examination. Tests of how the tooth responds to cold or electrical stimulation show whether the pulp is alive, which separates some types from others.
Two-dimensional X-rays taken from slightly different angles help locate the lesion. When resorption is suspected, a 3D CBCT scan is often the deciding step. It shows where the defect is, how large it is, whether it has reached the canal and whether it can be reached for repair, which a flat X-ray cannot show reliably. At Creative Arts, CBCT imaging is available for this kind of planning, and our page on dental X-rays and 3D scans explains when each is used.
Options from the most conservative to the most involved. Which applies depends on the type, size, position and how much healthy root remains.
| Option | When it is considered | What it involves |
|---|---|---|
| Monitoring | Mild orthodontic shortening, or small, stable lesions | Repeat X-rays at agreed intervals; orthodontic forces adjusted where relevant |
| Root canal treatment | Internal resorption and external inflammatory resorption | Cleaning and sealing the canal under a microscope removes the tissue or infection that drives the process |
| Repair of the defect | External cervical resorption that can be reached | Removing the resorbing tissue and sealing the defect, sometimes with root canal treatment; whether this is done here or by referral is decided after the CBCT |
| Removing the cause | Pressure from an impacted tooth | Extracting or orthodontically moving the tooth that presses on the root |
| Extraction and replacement | Extensive resorption or a root that cannot be restored | Removing the tooth and planning an implant, bridge or other replacement |
Early, small lesions have more options. That is the main reason to act on an X-ray finding rather than wait for symptoms.
Book an assessment soon if you notice a pink patch on a tooth, a tooth that has darkened or become loose, or a gum swelling next to an injured or root-treated tooth. Go to a hospital emergency department straight away for facial swelling with fever, swelling spreading towards the eye or neck, or difficulty breathing or swallowing. The clinic is open daily 10:00–20:00.
Dr. Marina Antoniuk (restorative and microscopic dentistry, root canal treatment) and Dr. Julia (microscopic dentistry, root canal treatment) review the imaging, explain the type of resorption and set out the options in a written plan.
Clinical statements on this page are consistent with these independent sources. They describe averages from studies, not a promise for any one patient.
Root resorption is the body's own cells breaking down part of a tooth root, either inside the canal or on the outer surface. How serious it is depends on the type, its size and how early it is found. Mild root tip shortening after braces is common and often harmless, while extensive cervical resorption can threaten the tooth.
Yes. Orthodontic tooth movement commonly shortens the root tips slightly, and research summaries report that comprehensive treatment increases how often and how severely root resorption occurs, with heavy forces particularly implicated. In most people it is minor. Orthodontists use light forces and take X-rays during treatment so that it can be spotted and managed early.
It can. An injury may damage the ligament around the root or the pulp inside, and resorption can appear months or even years afterwards, sometimes without symptoms. Injured teeth, particularly ones that were knocked out and replanted, should be followed up with X-rays, and old injuries are worth mentioning at every examination.
A pink tooth is a pink patch on the crown, usually near the gum, where resorption has hollowed out tooth tissue and the blood-rich tissue filling it shows through. It is classically linked with internal resorption and can also occur with external cervical resorption. A pink area on a tooth should be X-rayed without delay.
Often, especially when it is found early. Internal and inflammatory resorption usually stop once root canal treatment removes their cause, and accessible cervical defects can sometimes be repaired. When resorption is extensive or the root cannot be restored, extraction and replacement with an implant or bridge are discussed in a written plan.
Usually not in the early stages, which is why it is so often found by chance on an X-ray. Pain, swelling or looseness tend to appear later, when infection has developed or much of the root has been lost.
A standard X-ray is flat and can hide where a resorption defect really is. A 3D CBCT scan shows its position, size and depth, whether it reaches the canal and whether it can be accessed for repair. That information often decides between monitoring, root canal treatment, repair or extraction.
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