So I went back today to have my teeth scraped by the dental Hygenist, who is the pregnant daughter of my dentist. She said I was good, only one tooth needed real attention, and I know which one that is, so I'll give it an extra scrub in future. That cost me £45; I think that these scrapes aren't NHS. But worth it, to maintain what few teeth I still have. She suggested I come back in a year, by which time she'll be back on the job.
But as she poked and prodded and scraped, she found a loose filling - on the canine that had been giving me a problem! It looks like my dentist hadn't spotted it.
So I'm going back in a couple of weeks to get the filling replaced. It shouldn't be a big deal. I hope.