Root canal experiences? What should I expect?

Got three appointments lined up with an endodontist—basically a specialist for root canals. I should be getting local anesthesia, too.

The weird part is, I’ve never actually felt tooth pain before. But the X-ray showed some gum inflammation, and apparently, there's a cavity between two teeth because a filling cracked out of nowhere. No real reason for it, either.

Has anyone here gone through something like this?

Your topic is slightly off-target; you're talking about "dental nerves..."
Thanks