Yes. About 80% of cavities on baby teeth happen in between the back teeth where the floss gets. Regular brushing is important as well, but

It depends. If it’s not hurting, then I wouldn’t consider it an emergency, but the sooner you can get it placed back on, the better. 

Nobody likes getting cavities, but we also don’t want to give up what we’re eating. One thing that is not immediately obvious is that what