Hi, the dentist
told you that your tooth was anormal. It could be that a canal is missing or calcified. In that case it would be better to go for an extraction. Another dentist may have told you that the tooth could be saved by looking at it or by seeing the X-ray. But the thing is that calcified or unaccessible canals are encountered while treating the tooth. So it is upto you to go for extraction or go back to the first dentist and see whether he can complete the procedure because RCT needs a lot of perfection and experience and the approach differs from one doctor to another. Take care !