You poor thing Keira! Most things are safe at the dentist while pg, it's more a matter of you being comfortable! Obviously xrays are out, but LA is fine, there is one type that is safe to have during pg. If it's going to be a big job, get them to do something temporary for you and then deal with it properly later down the track. You can have it pulled out now, but you probably don't want to.

Good luck hun, hope it all goes well.

ETA They won't be able to use the bit that's fallen out, sorry hun.