I had root canal on one of my molars on the top, probably about 6 years ago. The dentist, who I like, did tell me I'd need a crown eventually. Money was tight so I never bothered and the tooth cracked about 4 years later. Crack seemed superficial enough so the dentist was able to do a crown and all seemed well. Tooth is absolutely fine when I'm well but when I'm sick or run down it aches. And now, every time I get a cold I seem to get sores on the roof of my mouth near to the site of the tooth. I have them now, they look like small little raw areas - not mouth ulcers really. Very sore and make eating very difficult.
Thing is, I never have them when I see the dentist. By the time I get an appointment they're usually gone. I am basically wondering if it's possible that I have some leftover infection in that tooth. My boss said this happened to him before so the idea is in my head. I said it to my dentist and he dismissed it, saying if I had an infection the tooth would be sore all the time, not just when I am sick or run down. But I never had sore teeth and sores in my mouth before having the crown fitted. Any thoughts just so I have a bit more info before I go back to see him?