Sorry to hear about your dental woes, BF. Personally, I hate going to the dentist but I hate dental procedures more so I'll keep up the preventative measures as best I can!
I've read that some drugs cause your mouth to become overly dry and this can cause what you're describing. Now, this is just information I've heard.....I haven't confirmed it....but it makes sense. Do you wake up with "cotton mouth" sometimes? Like you've slept with your mouth open all night and it's too dry? I don't know if there's anything you can take or do to prevent dry mouth. It really is too bad that the very meds we take to help us sometimes cause totally unrelated problems.
I hope you get some relief soon.