Hi,

When I want for my dental checkup in January, I hadn't been for a year (my fault, I moved and hadn't thought of having my checkup!) but I had no issues, other than mysterious white 'spots' appearing above my teeth in a certain area (near my incisors, little further back). One would disappear, then a few days/weeks later another one would pop up. They looked like the below:
*edit*

They weren't painful, just looked very unsightly. When my dentist saw these at my checkup, she gave me an x-ray and said there is a massive infection above my tooth and she was shocked that I haven't had any trauma to the area as that's what it looked like. She then performed a root canal on the tooth, and put cotton wool in the tooth to absorb the infection. I had the cotton wool in (with a temporary filling keeping it) for 2 weeks, went back and the infection was still present so could not complete the root canal.

I've now gone back 3 more times for her to try to finish it however the infection is still present - she said she's never seen anything like this before and arranged me to see a more senior dentist.

I'm a bit worried about this as the tooth is quite near the front and I don't want to lose it, but I'm also worried about infection being present in other teeth which may cause me to lose them too.

Has anyone seen this before? Any advice?

Thanks!