hello
the cause of pain in the area you described suggests that that the
root canal procedure done was not correct and theres` some infection left in the root of those teeth
now what i would suggest is that you get a radiogarph of your teeth done and than fix an appointment with an endodontist who will clarify the situation and will get re rct done for you
in the meanwhile what you can do to subside the infection is that you may take following
1.
levofloxacin 500 mg twice daily for 5 days
2.
metronidazole 400 mg twice daily for 3 days
3.combiflame twice daily for 5 days
also you need to do a lot of luke warm saline rinses
and for the later half of your query
yes if the orthodontic treatment is not successful (mostly due to age factor )than dentists go for cosmetic
rehabilitation of anterior teeth but there are`nt so many complications as is in your case
anyways ,stay calmed ,a good dentist (endodontist for rct and prosthodontic for crownplacement )will help you come out of your trouble
best of luck