1. You should have periapical periodontitis. In addition to trauma, it may also be caused by periodontal-pulp combination and pathological changes, that is, when there is no defect on the tooth surface, bacteria arrive at the periapical area from the periodontal pocket, causing inflammation. If I can look at your X-ray, it will be clearer (there are some other reasons that should be ruled out gradually).

If there is no improvement at all, you can stop taking anti-inflammatory drugs for so many days. If there is improvement, it is recommended to continue taking it.

3. Root canal therapy has little to do with tooth loss. The biggest influence on you is that your teeth may change color after root canal treatment, and you may break your teeth if you bite too hard, so you should pay a little attention to eating at ordinary times.

I suggest you go to another hospital and sign up in a big hospital.

It will help your diagnosis if you can provide the following information:

Are your teeth badly worn? Has the tooth that bit this tooth been treated? Do you usually have the habit of biting hard things? Is your dentition crowded? How is the periodontal condition?