I know we have lots of dentists and dental assistants on tpf, so if anyone of you are reading this, please give me some advice. I woke up last night had a weird sensation on my back tooth (corner left top). It feels like a very small pressure like when the dentist pushes on it with the metal thing, so it's not really pain, it's just pressure. Then I had a headache this morning, which is mostly gone but the small pressure on the tooth is still there. Weird thing is I blew my nose and I could feel alot of pressure above the tooth as I was blowing my nose. What in the world is that? Am I getting a cavity? Should I go to the dentist asap or do you think it'll pass?