To avoid this complication what must we do?

After completion of the R.C.T the outer covering should be strength ened by a "crown"

This crown could be in various types
* Metal porcelain crown

* Semi precious metal crown

* Precious metal crown

* Ceramage crown

Things to remember in your root canal treatment plan

Totally avoid biting from the toot canal treatment (done) side; as it increase the possibility of a fracture.

Make sure to go for the outer covering of the tooth after couple of weeks of the R.C.T. (at this stage since you don't have any pain or complication most probably you might neglect to go for a check-up) - This step is very important if you miss a complication;eg:fracture of the crown part of the tooth, dislodgement of the GP points of the R.C.T)

If the Dental surgeon advises to have a fabricated crown do not be reluctant to do so.
Since the cost of the crown is a bit high if you are unable to do so make sure to avoid biting hard substances from that particular side.
If you front tooth has undergone R.C.T make sure not to do any forceful biting. (eg: bottle opening, hard food breaking like frozen chocolates)
After many years of R.C.T you will totally forget about your R.C.T done tooth. Suddenly you might feel a part of the tooth/filling has fractured, but without pain. Make sure to go for a check up and get it attended by your dental surgeon. If not, you will end up with a complication which will lead to an extraction.