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Can you post a radiograph of the tooth please? From your description, the tooth may have Calcifi Metamorphosis of the pulp chamber following the trauma, so I am not expecting to see a pulp chamber etc on the radiograph. Treatment: you need a bleching ...

I would try internal whitening with Sodium Perborate, I would mix it with water I have mixed it with 35% hydrogen peroxide, however, I think the peroxide can cause resorption of the root if it contacts the root internally or your apical seal of the coronal ...