I know how you feel and sorry this post made you feel scared. If you have toothache you definitely need to go to the dentist. There are a lot of things that go on "behind the scenes" to make sure it's clean and contamination free, and even more so now with Covid! We have to take small risks in daily life and think how much trouble the dentist would be in if something were to be passed on. Other than those things I noticed which probably were cleaned before I even got in the room, everything was spotless. They wore masks, gloves, the dentist didn't touch the computer at all and got the nurse to do it instead, so all of the visible precautions were definitely there. It's just that OCD hangs on to that tiny "what if?"

Also, just to say as well when I posted this my anxiety was really high. It's subsided quite a lot now and even though I still get the occasional thought about it I'm able to get on with things pretty much normally these things subside over time!