Maybe it came on slowly, but have you noticed one or more of your teeth having a grey tint? If so, you may be wondering what caused it and whether it is something to worry about.

Grey tooth discoloration is different from the typical yellowing most people associate with your average tooth stains. It often has a different cause and, for that reason, a different fix.

Surface Staining vs. Internal Discoloration

Most tooth discoloration falls into one of two categories: extrinsic or intrinsic.

Extrinsic staining happens on the outside of the tooth. It comes from things like coffee, tea, red wine, or tobacco. This type of staining tends to look yellow or brown and can often be improved with professional cleaning or bleach-based teeth whitening treatments.

Intrinsic discoloration happens inside the tooth. The grey color you see comes from changes within the tooth structure itself, not just the surface. This type of discoloration is harder to address with whitening alone and may require a different approach altogether.

Common Causes of Grey Teeth

Here are some of the reasons your teeth may appear grey. Of course, it’s best to see your dentist to determine what the root cause of your tooth discoloration is.

Tooth Trauma

One of the more common causes of a single grey tooth is trauma. If a tooth was injured, the nerve and blood vessels inside the tooth can be damaged. A tooth can become discolored even if the injury occurred years ago. The grey color may appear gradually over time as the tissue breaks down, releasing byproducts that darken the tooth from the inside out.

Dead or Dying Teeth

A tooth that has lost its living inner tissue often turns grey over time. This can happen after trauma as mentioned above, or as the result of untreated infection or decay that reaches the nerve of the tooth. This type of discoloration typically occurs over time and is limited to the tooth or teeth affected. A root canal may be needed to remove the damaged tissue and prevent further complications.

Medications

Tetracycline antibiotics, when taken during childhood while teeth are still developing, are known to cause grey or dark banding across the teeth. This type of discoloration is deeply embedded in the tooth structure and cannot be removed with whitening. It is also worth noting that some medications taken as an adult can affect saliva production or oral chemistry in ways that contribute to discoloration over time.

Aging Dental Work

Silver amalgam fillings can cause teeth to take on a grey or dark appearance, particularly when the filling is older or positioned toward the front of the mouth. The metal can leach into the surrounding tooth structure and create a shadow effect that shows through the enamel.

Enamel Thinning

Enamel is the outer layer of your tooth, and it is naturally white. Underneath it is a layer called dentin, which has a naturally darker color. As enamel wears down from acid exposure, grinding, or aging, the darker dentin becomes more visible. Depending on the shade of your dentin, this can cause teeth to look grey, yellow, or dull.

Root Canal Treatment

Teeth that have had root canal treatment can sometimes darken over time, even when the procedure was successful. This happens because the internal tooth structure changes once the pulp is removed. In many cases, this can be addressed cosmetically as long as the tooth is otherwise healthy.

Treatment Options for Grey Teeth

Treatment depends entirely on the cause. Options may include:

• Professional Whitening – Professional whitening can be effective for surface-level or mild discoloration, but typically not for intrinsic grey staining.
• Dental bonding – Bonding is a tooth-colored resin applied to the surface to mask discoloration.
• Veneers – Thin porcelain shells are placed over the front of the tooth. Veneers not only improve color; they can also address tooth shape, gaps, and minor misalignment.
• Crowns – Crowns are used when the tooth structure is compromised or needs additional protection.
• Root canal – When the discoloration is tied to a damaged or infected nerve, you may require a root canal. This can be combined with options like a dental crown if needed.

If you have noticed a tooth that looks grey (especially if the change is new, getting darker, or accompanied by sensitivity or pain). We can help you understand your options for both the health of your teeth and their appearance. Contact our office to set up an appointment today!