Re the Dental hospitals -
I thought you had already investigated that after I suggested it weeks ago!
I remember a few years ago, I had what turned out to be an abscess in my gum.
I would get up in the morning and everything would be fine, but shortly afterwards I would start feeling unwell and a horrid taste in my mouth.
Basically as it turned out what was happening was, being a smoker each time I sucked on a cigarette I was drawing the poison down out of the gum and poisoning myself.
Once I told my dentist "what I thought was happening" it only took him a few minutes with the scalpel and 3 stitches later and no more problem.
Kitz. don't put it off any longer.
xx minutes in the chair versus how many days/weeks of suffering.
There will always be other functions, but there is only one of you.