Gum boil but doesn't feel like abcess. Xray/pics inside the thread

[Mark5]

Around 4 years ago I had a root canal and crown done on this tooth. 7 days ago I noticed I had some dull pain on this tooth after chewing there for a prolonged amount of time, noticed the gum boil and went to the dentist on the same day. He said that there nothing to see on the xray and recommended I take antibiotics for 5-7 days. Since than the pain when chewing has went away but the gum boil maybe decreased 20-30% if that. The thing is I had tooth abcess before and I am familiar with sensitivity to temperature/throbbing pain/feeling tooth is "full" and there is none of that here but the yellowish thing on the tip still makes me think this is bacterial? Your thoughts much appreciated

The tooth in question is on the right side on xray photo
https://i.postimg.cc/RZkQcx7C/RDT-20231207-2044434713850933756572044.png

https://postimg.cc/hXjRMQm6