Your dentist or an endodontist (root canal specialist) will need to do this bleaching procedure, which requires making a small opening in the tooth through which to bleach the tooth from the inside. If it is still a living tooth (and does not need a root canal), your dentist can design a single-tooth bleaching tray that will keep the bleach away from your other teeth, in order to create the best color match.
Once the dark tooth matches the rest of the teeth, that may provide the best cosmetic outcome. If the single dark tooth becomes lighter than the unbleached (other) teeth, then all the teeth can be carefully whitened together if needed.
Tooth-colored composite (plastic resins) or ceramic (porcelain) tooth restorations can't be lightened with bleach. They remain the same color.
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