I had root canal treatment to one of my teeth and the dentist place a temporary filling. however i saw that the teeth cracked. is it possible to save?

Where: Where is the crack. Depends on its length and location. See your Dentist. Evaluation/treatment by an Endodontist may be in order.

Most likely: Your dentist needs to evaluate the tooth, but a post and crown following root canal therapy is not uncommon.

May be possible: The advances in restorative dentistry are making it possible to save teeth that even a few years ago would have been lost. See your dentist for evaluation and treatment ASAP.

Contact DDS ASAP: Go to the DDS ASAP to determine whether the tooth is able to be saved. The dentist will do a clinical and radiographic examination if needed to determine the amount of root structure remaining and the possible need for crown lengthening or extraction/implant.