Dental fear is common, and it is nothing to be embarrassed about
If the thought of a dental appointment makes your chest tighten, you are in very ordinary company. Far more people feel this than ever say it out loud, and most of them look perfectly calm in the waiting room. Whatever you would call your own version of it, it is a normal human response and not a weakness.
There is a quieter part of this that people rarely say out loud. Feeling embarrassed about the state of your teeth makes it harder to come in, and staying away makes the embarrassment worse. That loop is what keeps people out of a dental chair for years, sometimes decades. It is worth naming plainly, because whatever comment you are bracing yourself for about how long it has been, you will not hear it here.