Initially, I did get an infection which was treat
ed by antibiotics, and then was fine. However, recently (e.g., August), the tooth
seems a bit achy (on and off) and the gum line
looks white-ish underneat
h the crown. The gum is not sore, however, and does not seem imflamed. Is this white gum normal with a root canal? Also, can you advise as to why the tooth might have started now (after 8 months) to ache on and off a bit?