A tooth turns grey due to internal bleeding, nerve damage, or staining from medications. This discoloration often happens after trauma or as a side effect of certain treatments.
When a tooth loses its blood supply, red blood cells break down into hemoglobin derivatives like bilirubin, which appear yellow or brown. Over time, these pigments darken to grey or black. The tooth's enamel becomes more transparent with age, making the discoloration more visible.
The most common reasons for a grey tooth include:
Many people assume tooth discoloration is always due to poor oral hygiene. However, even with excellent care, trauma or medical treatments can cause grey teeth. Unlike surface stains from coffee or smoking, intrinsic discoloration won't respond to whitening toothpaste.
Dentists offer several solutions, including:
| Treatment | Description | Effectiveness |
|---|---|---|
| Internal Bleaching | A dentist places a bleaching agent inside the tooth to lighten it from within. | High for trauma-related discoloration |
| Veneers | Thin porcelain shells cover the front of the tooth. | High for cosmetic improvement |
| Crowns | A cap covers the entire tooth, restoring its appearance and function. | High for structural and aesthetic repair |
For example, a patient who suffered a sports injury might undergo internal bleaching. The dentist would create a small hole in the back of the tooth, insert a bleaching agent, and seal it. Over a few sessions, the tooth would gradually lighten.
I once helped a patient whose tooth turned grey after a car accident. We used a combination of internal bleaching and a porcelain veneer to restore the tooth's natural color and shape. The results were immediate and dramatic.
While not all cases are preventable, wearing a mouthguard during sports and maintaining good oral hygiene can reduce risks. Regular dental checkups help catch issues early.