You have not mentioned what all you got done in the first part. ideally we do the root canal filling after preparing the tooth and then give the crown in the second phase. If the crown has come out then the dentist will decide whether the root part is sufficient and then you can go for post and core . If the root part is not sufficient to give the support then you have to discuss the treatment options with your dentist as without clinical examination and X-ray's it is difficult to give the treatment options. For more info on root canal treatment you can visit the following link on our website.
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