Everyone has been so kind. I've got back from the dentist and after a long old search, X rays etc, he can't really find anything and he suggests it will settle down on its own. He suggested it might be a muscular thing, grinding my teeth or something.
I appreciated his not diving in straight away and letting it sit for a while. Of course if it hurts, or if it gets worse I'll get it sorted straight away.
The good thing about going to the dentist is that you can be seen on the same day which would be a bit of a big ask these days, with GP surgeries so busy.
But thank you all for your kind concern.
Katie