>>2621666
Gum recession means you need a gum transplant. These come from the roof of your mouth, and take about two months to heal. If you go to a free dental clinic they may either do it for free or know someone who will, all because you're disabled.
I don't know about exposed nerves and cracks.
What I recommend you do is start flossing, and chew sugar free gum (buy a bunch for cheap on walmart dot com or amazon) after each meal. If you hate flossing, then buy flossers. Also buy sensitive tooth and remineralizing toothpaste, like Sensodyne.
Do not get any teeth pulled if you can avoid it, you'll lose jaw bone underneath the pulled tooth if you do.