The temporary crown on the back most lower tooth has broken. can I go without it until the appointment for the permanent on 9/21

part of the temporary is still in place. it is the very back tooth on the bottom. i have no discomfort. the problem is that it's friday night and i'm leaving for vacation on sunday. i can't see the dentist before monday the 19th even if i get hold of him. can i cement it back together with over-the-counter product--or is it best to just leave alone and not chew on that side? the dentist does have an answering service but the dentist won't be in until monday and by then i'll be in a different state.