always with the teeth problems

One of my back molars, that I got a really huge filling in five years ago, felt like it had a huge hole in it a few days ago. Like I woke up one day and I could feel something that felt like a huge crater in it with my tongue but it's so far back I can't really see what happened really well. I thought that maybe my filling fell out....somehow... except I don't really know if fillings do that. Anyways there was no pain so I was thankful for that and went to the dentist today.

Apparently, my teeth are clean and I'm doing a good job in keeping things clean and my filling is doing just fine BUT I FUCKING SOMEHOW BROKE OFF A HUGE PIECE OFF MY TOOTH AND I JUST DON'T KNOW HOW I DID THAT OR WHEN BECAUSE I DON'T EVEN KNOW WHAT HAPPENED TO IT. But I just need a crown so that should get taken care of in a few weeks.