front tooth root canal

I had a front tooth root canal about 5 months ago. Immediately thereafter my regular dentist said I needed a crown. She also felt that the tooth next to it get a crown. It was done. I noticed that a reoccurring blister still remains as it was before the root canal. I also notice that there is a slight sensitivity on the original root canal tooth. I just received a post card from the dentist that performed the root canal stating that a radiogrphic (x-ray) is necessary to assure that healing has progressed as expected.
What happens next?

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