Difference between pus and swollen area from novocaine needle

[terrifiedpatient]

I had a root canal. The tooth feels stronger and has less pain but feels a buildup right on area where needle
went in above same tooth. It feels like pus but it may be connective tissue or needle swelling. The tooth has not been brushed
in 8 years because it is a stub under a veneer.

 

[Busybee]

Give it a couple of days and if it's still a problem go back because maybe you need antibiotics. I don't understand why you didn't brush the tooth for 8 years? If tricky then a hygienist would know how to clean it. I'm saying this because once you have a root treatment you do have to take good care of the gums etc. You may need a crown long term to protect the tooth.