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Why is my tooth black after my crown fell off?

Published in Dental Health Issues 3 mins read

If your tooth appears black after a crown has fallen off, the most common reason is the presence of an untreated cavity. The dark discoloration often indicates dental decay that was either present before the crown was placed, or developed underneath it.

Understanding the Discoloration

When a crown comes off, it exposes the underlying tooth structure, which can reveal issues that were previously hidden.

Common Causes of Black Discoloration:

  • Untreated Cavities (Dental Caries): This is the primary reason for a tooth to appear black. Decay progresses from light brown to dark brown or black as it penetrates deeper into the tooth's structure, breaking down the enamel and dentin.
  • Old Filling Material: If there was an amalgam (silver) filling under your crown, the metallic material can cast a dark shadow through the remaining tooth structure, making it appear black or gray. Over time, amalgam can also cause staining of the surrounding tooth.
  • Staining from Decay or Restorative Materials: Even if the decay isn't immediately visible, products of bacterial activity or breakdown of old bonding agents can stain the tooth.
  • Root Canal Treated Tooth: Teeth that have undergone root canal treatment can sometimes darken over time. This is due to the lack of blood supply, residual nerve tissue, or the materials used during the procedure.
  • Exposure of Dentin: The underlying layer of the tooth, dentin, is naturally darker than enamel. If the crown was thin or the dentin is extensively exposed, it might appear darker.

What to Do When Your Crown Falls Off

Losing a crown can be alarming, but there's no need to panic. However, it is crucial to act promptly to prevent further damage or complications.

Immediate Steps:

  1. Save the Crown: If possible, retrieve the crown. Your dentist might be able to re-cement it, which can save you time and money. Clean it gently without scrubbing.
  2. Contact Your Dentist Immediately: Schedule an appointment as soon as possible. Delaying can lead to:
    • Further decay of the exposed tooth.
    • Shifting of surrounding teeth, making re-crowning difficult.
    • Damage to the exposed tooth from biting forces.
    • Sensitivity, pain, or infection.
  3. Temporary Care (if you can't get to a dentist right away):
    • Keep the area clean: Gently brush the exposed tooth.
    • Avoid chewing on the affected side: This prevents further damage to the exposed tooth and reduces discomfort.
    • Use dental wax: If the exposed tooth is sensitive or has sharp edges, you can cover it with dental wax (available at pharmacies) to protect your tongue and cheek.
    • Over-the-counter temporary dental cement: In some cases, your dentist might advise you to use an over-the-counter temporary dental cement to temporarily re-seat the crown until your appointment. Do not use super glue or other household adhesives.

Why Prompt Dental Attention is Important:

Issue Risk if untreated
Exposed Tooth Highly susceptible to new decay, wear, or fracture.
Sensitivity Increased pain when exposed to hot, cold, or air.
Tooth Shifting Adjacent teeth may move into the gap, affecting your bite and future crown fit.
Infection Bacteria can enter the exposed pulp, leading to pain, swelling, or abscess.
Chewing Difficulty Impaired ability to chew, potentially leading to discomfort or dietary changes.

A lost crown, especially one revealing a black tooth, is a clear sign that professional dental attention is needed to assess the underlying issue and restore your tooth's health and function.

For more information on what to do when a crown or filling falls out, you can refer to reputable dental resources like the American Dental Association.