Dental Implants + Bottom Teeth Q&A

Hi there I just got my crown placed today on my implant site and feel like my gum line is too low. It is not symmetrical with the tooth on the other side of my mouth and is noticeable from the front when I smile. My dentist briefly mentioned in the chair that the gumline would recede a tiny bit with time. Can anybody verify this? I've been having trouble finding my exact concern on the Internet. Is there any other procedure or option? I should ask for when I visit him next.?

My lower front tooth went through a root canal. In the event that it needs to be pulled, can I get a dental implant? My teeth are aligned and not crowded. I am smaller female. I read that lower front tooth implants are difficult to do.

Having last two bottom molars on each side removed, one cracked, one old crown. Would like to get my cross bite fixed as things are shifting around. Had braces 30+ years ago to align my teeth better. Wished I had the surgery but was afraid of having my jaw wired.

I had dental implants done in India. The bottom once are firm and perfect but the top once are loose and move and the slightest pressure causes excruciating pain. What are your recommendations ?