Can calcium-deficient individuals opt for braces or implants?

Hello doctor,

I am 28 years old and have had very minimal dental work. I have no molars whatsoever and about three to four teeth that have a filling connecting all that I'm pretty sure is decaying, one for sure has chipped recently. At this point, I have spoken with a few dentists who aren't really realistic about my options. I understand all dentists try to preserve as many teeth as possible for as long as possible but clearly, I can't afford extensive work. I do have dental insurance but I have other bills that consume my money not to mention I am calcium deficient. I was forced out of work for a couple of months due to my not being able to eat properly, it is very serious that I get an immediate fix. I personally want all of my teeth pulled and dentures but the dentist I have spoken with wants me to first try dental implants(which I cannot afford) then braces to help as well as fillings. It is extremely unrealistic. I am literally already suffering and careless at this point what few teeth I have are still healthy because they are discolored and majorly crooked. If I have to get implants in order to have braces, seven implants to be exact and I am being told I have to have all the upfront. I am basically being told who cares you cannot eat and come up with thousands of dollars to partially fix your problem when dentures cost far less and get me the exact same results. Please help.