Root canal treatment before crown placement

Sandy : good day. i became a member of different forums just to seek help coz idont want to make a bad decision again.

my case. my dentist extracted no.4 tooth upper&lower. the upper spaces is ok now-closed but horrible problem is the lower- huge spaces.
my NEW dentist told me my bite is better now and these are my options for the spaces
1. flexible/dentures
2.bridge crown

is it necessary to have rootcanal for crown placement? (some dentist i asked says so)

iwant to closed the spaces(by braces) crowns are expensive but its not advisable bcoz iwill again have a deeper bite or my lower will again move inward.
please enlighten me.
attached files for references
waiting. TIA
thnks for this forum

Ask the Dentist : Q: is it necessary to have rootcanal for crown placement?

A : No. Kapag infected lang.

Pwde ba magpadenture ng ilan lang

Ella : Good afternoon. Ask ko lang po kung pwede magpadenture ng 3ngipin lang. 5,6,7 po ang wala e sa taas po. Thanks

Ask the Dentist : Lahatin mo na. Halos ganun din. Read : http://www.denturescostguide.com/

May tutubo pa bang ngipin

Aiza : Hi doc! Magndang gabi. Ask q lng if possible pa po bang my tumubong ngipin don sa binunot if 24 y/0 na. Thnx

Dr. Jesus Lecitona : Paxray ka para makita kung may tutubo pa.

Aiza : My big chance po b doc n tumubo pa even the age is 24-25


Dr. Jesus Lecitona : Paxray ka para makita kung meron pang tutubo o wala na.