Fast answer: a tooth breaking at or below the gum line should be assessed by a dentist promptly. The visible break may not show whether decay, a crack, a failed restoration, or damage extending into the root is involved. Treatment depends on the location and depth of the break, symptoms, and how much sound tooth remains; an examination and sometimes imaging are needed before anyone can say whether the tooth can be repaired. Do not pull, file, glue, or try to fill it yourself. Call a dentist and describe the break, pain, sensitivity, swelling, and any recent injury to guide timely care.

Prompt dental assessment

A gum-line break needs an examination, not a guess from its appearance

Depth may be hidden

The fracture can extend below what is visible above the gums or involve the root.

Cause matters

Decay, a crack, trauma, or a large restoration can each change the assessment.

Get help promptly

Call a dentist, especially for pain, swelling, bleeding, or a recent injury.

Why might a tooth break off at the gum line?

A break near the gum can happen when the tooth has been weakened over time or when a sudden force acts on it. Possible contributors include decay below or near the gum, a crack that has progressed, a large filling or crown that has failed, trauma, or long-term wear and grinding. These possibilities can overlap. The visible break alone cannot identify the cause or show how much of the root and crown remain sound.

Gum-line breakage is a more specific problem than a small chip at the biting edge. For general recurring chips and breaks, see our guide to why teeth keep chipping or breaking. A break at the gum line needs its own focused assessment.

What a dentist may need to check

  • How far the fracture extends, including whether it reaches below the gum or into the root.
  • Whether decay or a failed filling/restoration has weakened the remaining tooth.
  • Whether the pulp (inner tissue) is affected, and whether there are signs of infection.
  • How much sound tooth structure remains and whether the tooth can be restored.
  • Whether pain occurs spontaneously, with biting, or with temperature; whether there is swelling or a recent injury.

The dentist may examine the tooth and use imaging when appropriate. A photograph or home mirror check cannot establish fracture depth or whether a root is involved.

Possible treatment depends on the extent

There is no single treatment for every tooth that breaks near the gum. Depending on the examination, a dentist may discuss repairing or protecting the remaining tooth, treating decay or a failed restoration, root-canal treatment if the pulp is affected and the tooth is restorable, or other procedures to make a restoration possible. If too little sound structure remains or the root is not restorable, extraction may be considered. The decision depends on the tooth’s condition, not appearance alone.

Do not attempt to pull the remaining tooth, file the edge, use household glue, or place a home filling. These actions can injure tissue or complicate treatment and do not address decay, fracture depth, or infection.

When to seek urgent care

Contact a dentist promptly for a tooth that has broken at or under the gum line, especially if the break is large or you have pain, sensitivity, swelling, bleeding, a bad taste, or a recent injury. If swelling is rapidly increasing, you have a fever with facial swelling, or it becomes hard to swallow or breathe, seek emergency medical care.

What to do while arranging care

  • Avoid chewing on the affected side and choose soft foods that do not press on the break.
  • Keep the area clean with gentle brushing. Do not probe the break with sharp objects.
  • If a fragment came off, save it and bring it to the dentist.
  • Tell the office when the break happened, whether pain is worsening, and whether you notice swelling or fever so they can advise on timing.

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