I have an upper bicuspid (right behind the canine) that was mostly
filling.  The filling crumbled the other day, leaving only about a
fourth of the tooth, if that; the part closest to the inside of my
mouth.
 I called my dentist and told them a filling had come out and they
asked if there was any pain; I said no.  They gave me an appointment
five weeks away.
 I then realized I may have understated the  situation and called back
expressed that, and they said all they could do is put me on the "call"
list in case of cancellations.
 Today I bumped that "sliver" of a tooth with my lower teeth and it
moved--has since moved back, but still not good that it's movable.
 My questions:
 Is it unlikely this tooth can be saved (crowned or otherwise) anyway?
 If it is, are the adjacent teeth likely to begin to crowd together
making any possible repairs much more difficult (since I waited 5
weeks)?
 Will my dentist, when he finally sees it, feel I should have explained
the gravity of the situation better and hence he'd have gotten me in
right away-- i.e.possibly have made the difference between losing the
tooth & saving it?
 Thanks in advance.