My dentist removed 4 pre-molars of mine for braces purpose. My question is, will the extraction sites resorp and once the other teeth are aligned to the extraction site will the tooth loose due to bone loss? And gum recession too?

I just got my braces tightened yesterday and in just 1 day it created a gap at my front teeth? Is it normal? I have 2 upper canine and she just bonded them and is that why? I'm using traditional braces, normal wire.