Reviewed By Dr. Tyler N Davis, DMD
Reading Time: 3 minutes
A tooth that turns grey usually indicates a change inside the tooth rather than a surface stain. This color shift often reflects damage to the tooth’s nerve, blood supply, or internal structure and should be evaluated by a dentist.
Table of Contents
Why Does a Tooth Turn Grey?
A tooth turns grey when the inner tissues of the tooth change color or break down. This most often happens when the pulp, which contains the nerve and blood vessels, becomes damaged or dies. As internal tissues degrade, pigments darken and show through the enamel, causing a grey or bluish, or pinkish appearance.
Unlike yellow or brown staining, grey discoloration typically cannot be corrected with regular whitening products.
Tooth Trauma Is the Most Common Cause
A blow to the mouth is one of the most common reasons a tooth turns grey. Trauma can occur from sports injuries, falls, accidents, or biting down on something hard.
After an injury:
- Blood flow to the pulp may be disrupted
- Internal bleeding can occur inside the tooth
- The nerve may slowly die over time
The tooth may change color weeks, months, or even years after the initial injury. In some cases, the tooth does not cause pain, which can delay diagnosis.
Nerve Death and Pulp Damage
When the pulp tissue inside a tooth dies, it begins to decompose. This breakdown releases dark pigments that discolor the tooth from the inside out.
Common reasons for pulp death include:
- Untreated tooth trauma
- Deep cavities reaching the nerve
- Cracked or fractured teeth
- Repeated dental procedures on the same tooth
A grey tooth often signals that the nerve is no longer healthy, even if there is no discomfort.
Internal Bleeding Inside the Tooth
After trauma, small blood vessels inside the pulp may rupture. The blood products can seep into dentin, the layer beneath enamel. As these blood components break down, they cause a grey, blue, or purplish/pinkish discoloration.
Old Dental Restorations or Materials
In some cases, older dental materials can contribute to a grey appearance. Metal-based fillings or posts placed inside a tooth may darken surrounding tooth structure over time, especially in front teeth.
When to Seek Dental Evaluation
A grey or darkened tooth may indicate internal damage following trauma or changes within the pulp. A dental exam is necessary to determine the cause and identify appropriate treatment options.
If you are in the Phoenix East Valley, book an appointment at our dental office in Mesa, AZ. Call (480) 664-1438 or visit us at 2500 South Power Road, Suite 102, Mesa, AZ.
FAQs
Why is only one tooth turning grey?
A single grey tooth usually indicates localized trauma, nerve damage, or internal bleeding affecting that specific tooth.
Can a grey tooth turn white again on its own?
Rarely. Some teeth regain normal color after minor trauma, but most grey teeth require dental treatment to address the cause.
Is a grey tooth always dead?
A grey tooth often indicates reduced or lost blood supply to the pulp, but some teeth temporarily darken after trauma and later recover. A dental exam and X-rays are needed to confirm whether the nerve is still alive.
Can a grey tooth be saved?
In many cases, yes. Treatment depends on the cause and may include root canal treatment, internal bleaching, or a crown to restore function and appearance. Early evaluation improves the chance of saving the tooth.