Sometimes one or more teeth have a gray color, and this happens when the tooth has suffered a trauma that has necrotic the dental pulp, or when the tooth has undergone a root canal.
Teeth whitening on a root canal tooth is an effective and conservative technique, unlike porcelain crowns or veneers. The color will change gradually until it reaches the color of the other teeth.
We share an interesting video, which explains in detail how you can change the color of a blackened tooth after a root canal.
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Souce: Youtube / Electric Teeth