### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
Hello I went to the dentist on Friday to have him look at a tooth that was bothering me. I have previously had a root canal on this tooth and the gums above it are very tender. He said looking at the x rays that he couldn t tell anything was wrong, but because I was having symptoms he recommended I see an endodontist if it didn t get better over the weekend. My dilemma is that I can t get an appointment until Thursday with the endodontist, but I m going out of town on Wednesday. So my question is: after already having a root canal on this tooth is it even possible for this problem to turn into the same excruciating pain I had before the root canal? If so, I ll find another endodontist to see me before I leave town. If not, I ll wait to see an endodontist after christmas.

### output:

Hello there...root canal treated (RCT) tooth at times might result in pain after some time...improper irrigation and cleansing of the root canals while performing the treatment will lead to remnant of pulp tissue and bacteria to accumulate...improper maturation, ( filling up of the canal) will lead to dead space within the canal leading to accumulation of microorganisms.this in turn would lead to infection causing you pain...second reason might be that if your tooth is mobile and root canal treatment done was correct, owing to the weak periodontal support (tissues around the tooth) of the tooth, infection would set in causing pain....get a radiograph done and get yourself evaluated... You can use a course of anti-inflammatory to overcome your pain...don't worry...if the RCT is not fine it can be re-done....