A. Hi, thanks for your e-mail, it is not unusual when a tooth has suffered a trauma in the way that your son’s has, for the nerve to die. In the process of the nerve dying, a patient will often suffer some quite severe pain although this is not always the case. Once this happens, the only treatment available to save the tooth in root canal therapy. This process involves removing all the infection from the root canal, then cleaning and filling it. Once this has been done, the tooth can be restored. I hope that this will be of some assistance to you. Kindest Regards. Dr Kailesh solanki.